Here is another way of explaining the incorrectness of (D). We know that (D) says that, as a way of protecting an organism, certain behavior patterns will persist interminably if periodically reinforced. But the passage appears to offer a counter-example to (D). In the passage, we are told that Arct...

(E) This is a very weak answer choice that doesn't affect the argument much ("Some"..."have lost it" - without indication of how long that it took...etc.). However, also understand that we are not concerned with merely talking about socially responsible businesses. We are trying...

I was unsure how to eliminate A, though I did sense that it was not the correct answer. Later I would see that the stimulus says nothing about whether, for example, "all" of the mentioned diamonds were formed 2.9 million years ago. The stimulus merely says that the scientists examined diam...