Insect Wings May Have Begun to Evolve as Lateral Extensions

Multiple Choice

Insect wings may have begun to evolve as lateral extensions of the body that dissipated heat for thermoregulation. When they had become sufficiently large, these extensions became useful for gliding through the air. Additional selection resulted in refinement as flight-producing wings. If this hypothesis is correct, modern insect wings would be an example of which of the following?

A) loss of Hox genes in the evolution of new forms
B) mutation
C) exaptation
D) adaptive radiation