While Hiking in Central Florida,you Are Lucky Enough to See

While hiking in Central Florida,you are lucky enough to see many swallowtail tiger butterflies.You observe that there are two types,or morphs,of the butterflies - a yellow morph and a black morph.What is a likely explanation for this?

A) The swallowtail tiger butterfly has undergone artificial selection.
B) The swallowtail tiger butterfly has undergone gene inversion for the gene that determines color.
C) The swallowtail tiger butterfly has more than one allele for the gene that determines color.
D) The swallowtail tiger butterfly has a single allele for the gene that determines color.