Pl help Read these lines from "The Rainy Day."

Be still, sad heart! and cease repining;
Behind the clouds is the sun still shining;
Thy fate is the common fate of all,
Into each life some rain must fall,
Some days must be dark and dreary.

What does the phrase "Into each life some rain must fall" mean?

A. Sometimes it's good to be unhappy.

B. Everyone faces times of unhappiness.

C. It is foolish to be unhappy.

D. All lives eventually come to an end.