Which of the following is an example of codominance?

A)a scorpion's venom is more potent when it's younger
B)in roan cattle,you can see a mix or both red and white furs
C)flowers of a certain plant can come in purple,blue,or yellow
D)there are many possible mutations that lead to white eyes in flies
E)a certain plant can have jagged,rough,or smooth edges on its leaves