Which Strategy Is Used by Plants in Hot,dry Climates to Conserve

Which strategy is used by plants in hot,dry climates to conserve water?

A) They have a thick,waxy coating on their leaves.
B) They have stomata that open during the day to capture carbon dioxide and reduce water loss.
C) They extract oxygen from airspaces within the plant in order to keep stomata closed.
D) They have small,thin leaves.
E) They produce less chlorophyll to limit the need for water.