Why do many desert plants have small leaves?

Student Answer:
A.Deserts are cold, and small leaves help hold in heat.
B.Small leaves protect desert plants from animals that eat plants.
C. Leaves that have a small surface area lose less water.
D.Small leaves protect desert plants from pollution.
So I know its c but why?

Question

Why do many desert plants have small leaves?      

 	Student Answer:		 
A.Deserts are cold, and small leaves help hold in heat.
B.Small leaves protect desert plants from animals that eat plants.
C. Leaves that have a small surface area lose less water.
 D.Small leaves protect desert plants from pollution.
 So I know its c but why?

compassionate · Answer

Because there's less of a surface area exposed to sunlight; which reduces evaporation.

anonymous · Answer

oh thank you so much!