C. Is the correct answer. I believe.
There passage is trying to make it clear/logical about the topic in a straightforward manner
Since misery and depression are both sad/bad kinds of feelings, then we have to find a pair of words that have the same kind of feeling in order to complete this analogy. The correct answer should be melancholy and boredom.
Answer:
B
Explanation:
No one has been able to satisfactorily explain
how or …why… The Moon sporadically sparks.