A scientist has kept records of the color variations in a field of phlox for several generations. Phlox is an annual plant that produces flowers in a variety of shades ranging from white to red. Initially the field contained equal proportions of white, pink, and red flowers. By the end of the study the proportions of flowers in the field were 80% red, 15% pink, and 5% white. Which of the following inferences best explains the change in flower color proportions?
Bees visiting the field are more likely to see the white flowers and gather pollen from them.
The red flowers produce fewer seeds than the white flowers.
A predator has been introduced that prefers to eat red flowers.
Some environmental change has happened that favors the red flowers.