Since boxes can be made of cardboard, we need to pick out an answer choice in which the first word describes a substance of which the second word can be made. Both "clay is to pot" and "metal is to chain" could be correct answers. However, "clay is to pot" is the better answer because a pot, like a box, is a type of container, unlike a chain. So, the correct answer is "clay is to pot."

In a "square" and a "circle" the distance from the center to any point on the outside is always the same as the distance from the center to any other point on the outside. A "circle" might be seen as "a round square." So, which of these could be seen as a "round rectangle?" The correct answer is an "oval." An "oval" is a round, elongated shape. Additionally, a "sphere" is a three-dimensional circle, an example of a "sphere" is a "globe."

A group of "tradesmen" is called a "guild." So, to solve this analogy you need to determine which of these, when taken as a group, is called a "coven." The correct answer is that a "coven" is a group of "witches." 

An "encyclopedia" is a book that contains a collection of "information." So, to solve this analogy you need to determine what an "anthology" is a collection of. The correct answer is that an "anthology" is a collection of "stories."

"Downs" are small, rolling hills made of "grass." So, to solve this analogy you need to determine what it is that "dunes" are made of. The correct answer is that a "dune" is made of "sand." "Dunes" are typically found in the "desert."

A "portfolio" is a collection of "artwork" produced by an individual. So, if a "portfolio" is a collection of "artwork," what is a "troupe" a collection of? The correct answer is that a "troupe" is a group of entertainers, like "artists" or musicians, who travel and perform together. 

"Lumber" is timber that has been chopped into planks. It is made from "wood," so to solve this analogy you need to determine what an "anvil" is made from. Well, an "anvil" is made from "iron," it is a type of "hammer" used to shape metal.

A "phalanx" is a type of military formation. It is comprised of "soldiers," so to solve this analogy you need to determine what a "retinue" is comprised of. Well, a "retinue" is a group of people with various skills and abilities who give advice to a ruler or other such important person. So, the correct answer is "advisers."

Since a speedometer measures speed, we're looking for an answer choice in which the first word measures what the second word represents. While "binoculars are to sight" might seem like a good answer, because binoculars are a device that enhance your sight, it doesn't represent the "measuring device is to measured quantity" relationship that we're looking for.  "Odometer is to distance," however, does represent that relationship, as an odometer measures distance, so "odometer is to distance" is the right answer.

The best choice is "odometer is to distance." The relationship between "clock" and "time" is that a clock measures time. Likewise, an odometer is a device in a car which measures distance traveled. Considering the other options, "length is to ruler" is the only other choice with the correct relationship, but it is not in the right order as it is worded what is being measured to measuring device instead of measuring device to what is being measured as it is in the question. "Meter is to yard" is incorrect because a meter and a yard are both two different units that measure length. "Degree is to temperature" is incorrect because a degree is a unit of measurement for temperature (not a device that measures temperature) and temperature is the thing being measured. "Volume is to gram" cannot be correct as volume is what is being measured while a gram is a unit of measurement (albeit the incorrect one for volume).