Question

Which type of cloud indicates a drizzle or rain?

Answer 1

B. Stratus 
Nimbus clouds are the ones that bring rain. They are called nimbus, because "Nimbus" comes from the latin word for rain "imber"
But Cumulonimbus or nimbostratus clouds are possible. 
Most stratus become nimbostratus, or rain clouds

Answer 2

I believe the answer is b stratus