Hi! So I understand why D is correct but I thought that the sentence "the position that X is unsustainable" was the position the author was trying to defend. In that he/she is defending that it is unsustainable. Why is this thought process not right? It's why I picked B
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Hey Isaiah4110, not sure if I'm a bit late, but for anyone else here's why A is wrong.
The condition that A serves as a referent for is a sufficient condition whereas the claim in the question stem is actually a quasi necessary condition. I hesitate to state necessary because it did not give us a must factor.
In order to do X, it is important for Y. But by no means does having Y guarantee X.
In order the be the world's fastest runner, it is important to have two legs and be Jamaican.
Welp, I have two legs and I'm Jamaican, so where's my medal? It's not a sufficient condition for getting a medal, sadly.