A population of crabs live on a light-colored sandy beach. In this environment there is a population of birds that eat the crabs. One year, there is a volcanic eruption near the beach and dark volcanic ash covers the beach. The sand is now much darker than it used to be. Scientists studying the area are most likely to predict which outcome? A.
Some of the light-colored crabs will try to change their body color to be darker and pass on those traits to their offspring.

B.
Some of the light-colored crabs will try to change their body color to be lighter and pass on those traits to their offspring.

C.
Some of the crabs born with the body color traits that do not allow them to escape the birds will likely survive and pass on those traits.

D.
Some of the crabs born with the body color traits that allow them to escape the birds will likely survive and pass on those traits.