The α-globin and β-globin gene families are found on different chromosomes in humans.What is the suspected reason for this?

A)They evolved at different times.
B)There was a gene duplication event.
C)The α-globin originally coded for a different protein family.
D)Our ancestors didn't use the α-globin genes.
E)They were originally on the same chromosome but one set was moved via transposable elements.