You Might Expect the Evolution of Specialized Animal Pollinators and Specialized

You might expect the evolution of specialized animal pollinators and specialized flowers because ______________.

A) This ensures that both can survive.
B) A specialist pollinator will likely be able to discriminate between plants and therefore not move pollen between heterospecifics.
C) There is no precedent that suggests that this should be expected.
D) A specialist pollinator will likely only visit one plant and pollinate only that one plant which will therefore increase the plants fitness.