Hi @kyland, For these, we disprove wrong answers by pointing to a specific part of the passage. A) wrong, because Temple's critics are discussed in the fourth paragraph and they don't mention why they have durable pit walls. B) L58-62 say that this decline "could be due to other factors", meaning B is supported. C) Correct! L54-57 say that only a minority of unabraded seeds germinate, so it's not surprising that the tree isn't abundant. D) L57-58 say that the number of seeds which germinate explains why the tree isn't going extinct. E) L54-57 say that a minority of seeds may germinate unabraded.
Hope this helps, feel free to let us know if you have further questions.