Q. Consider the following statements:
1.Mammatus clouds are usually formed in association with stratocumulus clouds.
2.Mammatus clouds are a type of unusual and distinctive cloud formations due to a series of bulges emerging from the base of a cloud. 
3.The shape of mammatus clouds formations varies.
Which of the statements given above are correct?

[A] 1 and 2 only

[B] )2 and 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: B
Notes:

Explanation –

Statement 1 is incorrect. Mammatus clouds are usually formed in association with large cumulonimbus clouds.

Statement 2 and 3 correct. Mammatus clouds are a type of unusual and distinctive cloud formations due to a series of bulges emerging from the base of a cloud. The shape of mammatus clouds formations varies.

Source: ForumIAS