Blue poppies native to China are grown at a plant-breeding center in California.

Blue poppies native to China are grown at a plant-breeding center in California. Those with the thickest leaves survive and reproduce best in California's drier climate.

This evolutionary adaptation of the poppies to their new environment is due to .

a) genetic drift

b) neutral variation

c) disruptive selection

d) directional selection

e) stabilizing selection