The correct answer is C) genetic variation.
The term that best describes the difference in colors of the birds below is genetic variation.
A genetic variation describes the variation of the sequence of the DNA in our genomes. This genetic variation allows humans, plants, and animals to have specific characteristics. In the case of the picture with the birds, these birds show a difference in colors due to genetic variation. Genetic variation is part of evolution, the genetic information that passes down from generation to generation.