Which of the Following Is True of The $\underline { \text { mesosphere } }$

Which of the following is true of the $\underline { \text { mesosphere } }$ ?

A) It contains clouds that are visible at night.
B) Windstorms involving wind velocities in excess of 320 kmph (200 mph) occur in this layer.
C) It is the coldest layer of the atmosphere.
D) All of these are true.
E) None of these are true.