Why Do You Think an Ocotillo Plant That Lives in the Deserts

Why do you think an ocotillo plant that lives in the deserts of the southwestern United States loses its leaves?

A) It is a deciduous plant like many trees in the eastern part of the United States, and it sheds its leaves in the fall in response to decreasing day length.
B) It sheds it leaves because of cold weather.
C) It sheds its leaves because of hot weather.
D) It sheds its leaves when it becomes desiccated, in order to prevent further water loss.
E) It sheds its leaves when there is too much water.