The innate immune system includes structures that prevent infection, as well as those that take on a non-specific, but active role. A macrophage would be a good example of a non-specific, active innate immune cell. The remainder of the options, with the exception of a neuron, are also preventive structures. Epithelial cells form a barrier to the outside, potentially contaminated environment. Microglia are monocyte-derived, macrophage-like cells in the central nervous system. Astrocytes form the blood-brain barrier, preventing potentially infectious material in the blood from getting to the central nervous system. As neurons lie behind this barrier, they would play the least important role in any kind of innate immunity.

Superoxide dismutase is in the same radical pathway that involves NADPH oxidase. As a result, it is most likely to be found in nonspecific cells of the innate immune system, such as polymorphonuclear cells.

C3b is involved in coating bacteria to tag them for degradation by phagosomes, and is activated by the complement system. The alternative complement pathway is activated during innate immunity and activates C3b.

All B-cells are involved in adaptive immunity, including memory B-cells and plasma cells (which as derived from B-cells). C1qrs is involved in the classical complement pathway, but requires antibody-antigen interaction from the adapative immune system.

Plasma cells are the only answer option that is not involved with phagocytosis. Plasma cells are derived from B-cells and serve as the primary source of antibody production during the adaptive immune response.

C3b coats bacteria so that macrophages target them for ingestion. Neutrophils are also capable of causing cell lysis and phagocytosis.

The innate immune system is the non-specific immune system that you are born with. Cells of the innate immune system include mast cells, macrophages, neutrophils (and other white cells), natural killer cells, and complement (a group of proteins found in the blood). The B cells are associated with the adaptive immune system, producing antibodies, and providing a memory component of the immune system. The innate immune system does not have a memory component. 

A mast cell is similar to a basophil in that their granules, which contain histamine and heparin, produce inflammation when released. Also, mast cells play a role in angiogenesis during wound healing. A T-cell is a cell that targets infected cells to destroy. Plasma cells are antibody-producing cells. B-cells form plasma and antibodies in response to specific antigens.

Mast cells contain granules which are released to cause inflammation and attract other cells to the area. B-cells that form plasma cells and antibodies when a specific antigen is recognized. Dendritic cells are those that process proteins in lymph fluid, they have long "arms." Macrophages are the cells that engulf and consume cell debris or infectious organisms. 

B-lymphocytes are part of the adaptive immunity system, they create plasma cells and antibodies when they recognize a specific antigen. Monocytes are what macrophages are before they leave the bloodstream. Basophils contain granules of histamine which produce an inflammation response when released. Natural killer cells attack infected or cancerous cells.

B-cells are stimulated by antigens, which in turn leads to antibody production. Antibodies then are used to neutralize invaders or tag them for destruction. T-cells are divided into helper T-cells, killer T-cells, regulatory T-cells types. Natural killer cells destroy cells that have become infected with pathogens and additionally also cancer cells. Basophils are a type of granulocyte that are active in allergic and inflammatory responses. 

Since the woman is B negative, she makes antibodies against A blood as well as Rh positive blood. This means that blood that has either A or positive antigens cannot be transfused. Type O blood does not carry any surface antigens. If the blood is O negative, it can safely be transfused into a B negative patient.