The ectodysplasin gene of stickleback fish in fresh and salt waters provides a good example of pleiotropy,because it ________.

A) affects both growth rate and bony armor of a stickleback
B) includes a DNA-binding homeodomain
C) has been duplicated repeatedly to create a whole family of variants
D) has been transferred from another organism
E) allows different populations of stickleback to interbreed