And what was left over, we couldn’t spend all at once, because we had to keep some savings “for a rainy day”, those time when he didn’t have any work. In this sentence, what does a rainy day mean?

And what was left over, we couldn’t spend all at once, because we had to keep some savings “for a rainy day”, those time when he didn’t have any work. In this sentence, what does a rainy day mean?
A.A day when it rains.　　　　　　　
B.A lucky day.
C.The time when people are unhappy.　　　　　　　　
D.The time when people are poor.
正确答案：The time when people are poor.