Sorry for such late an answer, but I believe its A) Predicate Nominative.
She is speaking about times in which man becomes most desperate that in times where one is attacked, hurt or in a position from which something awful may occur they become their most powerful. This can be related to times where you struggled and found strength within yourself to do what you thought was impossible.
The theme is the message that an author is trying to get his or her readers to understand. For example, in the Greek myth of Daedalus and Icarus, the theme was "don't be prideful". Because Icarus and Daedalus violated this by trying to act like the gods, they were punished: Icarus fell into the ocean and drowned.
Where are the sentences ?
The think about Mr. Utterson and Mr. Enfield is that they almost have nothing in common and they came from different background and reputation.
So, what other people think of Mr.Utterson's friendship with Mr. Enfield would be : they do not understand why the men are friends
hope this helps
