The correct answer would be option C: "feels slightly foolish about the events that occur", this due to the way the excerpt is written, since, it seems the author wanted to let the readers know that the narrator isn't stupid, so that they keep that in mind, when they read about a foolish thing said narrator did. If the narrator did something dumb, then option A and B would be discarded, as would option D.
"living in exile"
This is referred to as living in exile, because the 24th row is the "x-aisle", which is a play on the word "exile" because that's what it sounds like out loud. Typically, this is used as a joke or a pun in algebra or another math class.
Unethical, musician, antibody.
These are just prefixes and suffixes that match your descriptions.
I think that it is:
A.
Adults cannot appreciate the beauty of the natural world as children can.
Hope this helps 1. Sky high