‘When it rains, it pours’

The sentence, ‘When it rains, it pours’, means:

Choose one answer.

a. Never start something unless you intend to finish it straight away.

b. Flooding is likely.

c. The wet conditions make us realise how good it is when it is sunny.

d. When someone experiences bad luck it is normally followed by further bad luck.

i think D is correct. Just want confirmation.