Explanation:
An excerpt means an extract, a portion that has been taken away. The word mocking too is extracting things from one and imitating.
A. Troubled: The meaning of troubled is to express the tough situation or a sad situation where a person find difficult to come out of the problem.
B. Mocking: It means making fun, imitating someone's action to make fun or irritate him/her.
C. Frustrated: It is the word to express the inability to change something or reach success.
D. Mysterious: A strange thing which is difficult to understand or something new.
