The Human and Chimpanzee Sequences for a Particular DNA Segment

Multiple Choice

The human and chimpanzee sequences for a particular DNA segment are being aligned.Both happen to be the same length, but you know that there is a three-nucleotide insertion in the chimpanzee sequence, relative to the human sequence.The most likely explanation is that there was a

A) deletion in the chimpanzee sequence.
B) transition in the chimpanzee sequence.
C) deletion in the human sequence.
D) transition in the human sequence.
E) transversion in the human lineage.