If a person has trouble understanding a passage even after reading it slowly they should look up confusing words in a dictionary .The correct answer is B.
If it’s talking about the month of April then it’s personifying April comparing the rainfall to a human shaking off their hair and if their comparing that then the rain is probably heavy and falling fast and hard
I believe it's 3, parenthetical expression
Third option, adding more supporting details to make your point.
Summaries should not contain new points or evidences. Instead, they should only conclude and briefly recount what is already written.