Flower Color: not Heritable but ENvironmentally determined?

Question

A Flower ranges from blue to pale blue to bright white. This plant is primarily pollinated by a bee that prefers blue flowers to white flowers. Blue flowers have a greater relative fruit set than the white flowers. Nevertheless, the percentage of different flowers colors remains stable in the study population from year to year. Which of these statements might explain this observation?

A)Reproductive Success does not affect evolution in this species.
B)The white flowers have evolved pollinator resistance
C)Fitness is primarily determined by fruit set in species
D)Flower Color is not heritable but is instead environmentally determined.

I am thinking it is D but not sure, please help.

Answer 1

I would think D as well, here is why:

I would assume that the color of this flower is determined by the nutrients in the ground. If there isn't enough of whatever nutrient the plant needs to make blue flowers, it will be forced to make white flowers, even though the blue may be more favored by selection.