Officials attempt to control the spread of an exotic wildflower species by introducing its natural predator, a beetle. Unexpectedly, the beetle population grows exponentially and begins to eat local crops. What best accounts for this unexpected population explosion?

a. Adaptive radiation allowed the beetle population to evolve faster.
b. The beetle population has few predators in the new habitat.
c. The wildflower and local crops are genetically similar kinds of plants.
d. The beetle has different nutritional requirements in the new habitat.