A new hybrid species of flower comes in four color varieties: red, white, yellow, and purple. An equivalent amount of each variety is planted in a meadow. Below is a description of each of the varieties.
red flowers: pollinated by hummingbirds
white flowers: pollinated by moths
yellow flowers: pollinated by bees
violet flowers: pollinated by butterflies
After 100 years, the meadow is mostly covered by the violet variety. Only small patches of the other varieties remain.
Which of the following most likely contributed to the dominant presence of violet flowers?
A. an abundance of humming birds in the meadow
B. an abundance of bees in the meadow
C. an abundance of moths in the meadow
D. an abundance of butterflies in the meadow