Can i see the first paragraph?
From the excerpt given above, 'fits in' as used in this passage means to feel comfortable and acceptable in a place, thus the correct option is A. An idiom is a group of words that is not taken literally, that is, their meaning can not be deduced from those of individual word. 'Fit in' as an idiom means to be comfortable with something or someone, to be in harmony with that thing.
Answer:
look for reliable sources; keep track of sources; specify relationship between keywords
Explanation: