Biology

The correct answer is: A.Allopatric speciation

Explanation:

Chimpanzees and bonobos evolved from a common ancestral species after the Congo River formed a geographic barrier, dividing their population. This physical separation led to reproductive isolation, and over time, the two populations evolved into distinct species due to different environmental conditions on either side of the river. This is an example of allopatric speciation, where a geographic barrier causes populations...