You Know That a Particular Stretch of DNA Changes at the Rate

Multiple Choice

You know that a particular stretch of DNA changes at the rate of 1 base per 10 million years.You sequence this length of DNA in two species and find that they differ by 4 bases: AATGCGATCG and AATGTTATGC.Based on these data,how long has it been since these two species diverged? (Hint: Ancestral sequence is AATGCTATGG.)

A) 10 million years
B) 20 million years
C) 40 million years
D) 100 million years