Two Sisters from the Middle of the United States Move

Two sisters from the middle of the United States move. One loves snow and moves north to the Upper Peninsula of Michigan. The other moves south to the warm Gulf Coast. Each takes seeds from a variety of poppy that has been in the family for generations. Ten years later, the plants have changed. Those in the north are stocky, have reddish-purple flowers, and bloom within a month of planting. Those in the south have become tall, have single pink flowers, and bloom several months after planting. What has most likely happened?

A) temporal isolation
B) population bottleneck
C) allopatric speciation
D) behavioral incompatibility
E) adaptive radiation