Use the Following Information to Answer the Questions Below

Multiple Choice

Use the following information to answer the questions below.
Radish flowers may be red, purple, or white. A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring. The part of the radish we eat may be oval or long, with long being the dominant characteristic.
-The flower color trait in radishes is an example of which of the following?

A) a multiple allelic system
B) sex linkage
C) codominance
D) incomplete dominance
E) epistasis