The best answer choice is "Stegosaurus was a large herbivorous dinosaur that lived during the Late Jurassic period, the same period during which dinosaurs like Archaeopteryx, Pterodactylus, and Brontosaurus lived." This answer choice provides a general introduction of Stegosaurus that works well as a sentence preceding the details about Stegosaurus and its name found in the rest of the paragraph. 

"Many carnivorous dinosaurs ate herbivores like Stegosaurus, Brontosaurus, and Apatosaurus to survive." - This answer choice introduces three dinosaurs, so it doesn't function as well as the correct answer does as an introductory sentence to a paragraph about Stegosaurus. 

Dinosaurs have fascinated modern humans since we started uncovering their massive bones buried in the Earth." - This answer choice introduces the concept of dinosaurs in general, but is too general to serve as a good introduction to the rest of the paragraph's details about one particular kind of dinosaur.

"Museums are great places to learn more about dinosaurs as well as other ancient animals like mammoths and saber-toothed cats." - This sentence introduces the concept of museums as a location to learn about many types of ancient animals. It is far removed from the details about Stegosaurus found in the rest of the paragraph.

The sentence about lead type vs. wooden type and and the sentence about illuminated manuscripts are related to the history of book publishing, but not to the contents of the paragraph specifically. If either were used as the concluding sentence for this paragraph, it would make for a confusing, irrelevant conclusion. 

Both of the remaining answer choices shown below relate to the history of publishing and specifically to the invention of the printing press and moveable type, so we need to focus on how they differ.

"Moveable type and the printing press had a huge effect on Europe and helped pave the way for the Scientific Revolution, which was in full swing in the seventeenth century."

"Due to the way it decreased the time and effort involved in publishing and distributing a book, the printing press and moveable type together helped create a publishing boom in which books became more accessible than ever before in Europe."

The answer choice here listed first summarizes the effect that the invention of the printing press and moveable type had on Europe before considering how this event helped cause the Scientific Revolution. The Scientific Revolution isn't mentioned anywhere in the paragraph provided, so it is off-topic in this particular paragraph. This sentence would thus not make the best conclusion.

The best answer is the answer choice here listed second. This sentence summarizes the effect that the printing press and moveable type had on the European publishing industry at the time, which is much more closely related to the content of the provided paragraph.