Thanks for your question! This is a really tough one, so I do think it's especially important to understand the argument even before launching into the answer choices. This looks like a really good candidate to diagram in terms of conditionals. If you do that, you should get the following. IP ->...

For question 14, what clues in the text would lead to showing that B was the right answer? I didn't really find any of the answers choices for this one that appealing.