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I eliminated B and D and chose C. I am really stumped on the reasoning for this. I picked C because I thought the loss of teeth and traveling at the back of the herd could be correlated with: groups they live in-->diets--->size and shapes of face.
Can someone help me understand this reasoning? Please!!?
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So we know that group size and distance traveled is highly correlated with diets, and diets depend in large part on, or are a function of, teeth/face shape.
Putting these two relationships together, we have enough information to infer that teeth/face shape can provide information about an animals group size/distance traveled (because if the first two are highly correlated, and diet depends on teeth/face size, then the first phenomena is correlated with the last). This is how we end up with answer choice E! Because being a herd animal is a way of saying an animals group size/distance traveled.
C is incorrect because we don't have any information where animals travel in their respective herds. There's no support for a spatial inference like this.
Hope this helps!