Biology

The correct answer is: B.Geographic separation

Explanation:

The primary factor that leads to allopatric speciation is geographic separation. In allopatric speciation, a population becomes physically divided by a geographic barrier (such as a mountain range, river, or desert), which prevents gene flow between the separated groups. Over time, genetic differences accumulate in these isolated populations, eventually leading to the formation of new species.

The other factors listed are more relevant to other types of speciat...