What Does the Presence of the Two Base Pair Deletion

What does the presence of the two base pair deletion in the genomes of six widely dispersed human populations,and the absence of the deletion in all non-human primates reveal?

A) That the two bases were actually insertions in the non-human primates
B) That the deletion arose before the branch between humans and non-human primates
C) That the deletion arose multiple non-human primates
D) That the deletion arose at least six times in different human populations
E) That the deletion arose after the branch between humans and non-human primates