Over many years, the climate on the west side of the island has undergone drastic changes while the climate on the east side has remained the same. it is most likely that population b will1) migrate and intermix with population a2) become extinct3) have evolved more than population a4) have evolved less than population a

The correct answer is 4) have evolved less then population A.
The population B will have no evolutionary pressure to change since the environment has stayed the same. On the other side of the island, population A is facing a life and death situation, it has a big evolutionary pressure to change in order to survive, so it evolves according to the new environment, thus becoming more evolved then population B.

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