Task: Question Answering
Input (English): Two species of garter snake in the genus Thamnophis originated from a single ancestor. These two species live in the same geographic area, however, one lives in arid land and the other lives in water.Which of the following best identifies the cause of speciation between these two garter snakes?  
 (A) mechanical isolation (B) behavioral isolation (C) habitat isolation (D) allopatric isolation
Output (English): C