Which one of the following is the cloud that is dark-grey or black, found at very low height and brings the real rain?

A. Altocumulus

B. Cirrus

C. Cirrostratus

D. Nimbostratus

Answer: Option D

Solution(By Examveda Team)

Nimbostratus clouds cover the sky in a dark gray layer. They can extend from the low and middle layers of the atmosphere and are thick enough to blot out the sun. Nimbostratus are the quintessential rain cloud.