Small mice fit nicely into coat pockets.
The complete predicate in this sentence is "fit nicely into coat pockets."
This is because a sentence is made up of two halves: the complete subject and the complete predicate. The latter of these two makes up the part of the sentence that <em>describes</em> the subject, or what the subject is <em>doing</em>.
I'm assuming that this is out of a passage. I can't answer the question without the passage.
Answer:
B
Explanation:
....................... it's B
An idiosyncrasy is a characteristic, habit, mannerism, or the like, that is peculiar to an individual.