Which of these clouds produces substantial precipitation? A) ...

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Which of these clouds produces substantial precipitation?
 A) altostratus
  B) cirrostratus
  C) cumulus
  D) nimbostratus
  E) none of the above

Question 2

Cumulus
 A) can occasionally produce rain, if the clouds are taller than they are wide.
  B) is common in winter.
  C) is uncommon in summer.
  D) is found at middle altitudes.
  E) usually signals an approaching warm front.

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Answer to Question 1

D

Answer to Question 2

A