Which of the Following Occurs at Some Stage During the Development

Which of the following occurs at some stage during the development of a chinook wind? (Assume rain occurs near the mountain summit.)

A) Compression of the air as it rises up the windward side of the mountain.
B) Increase in specific humidity of the air near the summit.
C) Decrease in relative humidity during the air's ascent up the windward side.
D) Compressional heating of the air on the leeward side.