Which is an example of codominance?

PLZZZZZZ HELPP LAST QUESTION!!!!!

A.A dog with white fur and a dod with black fur mate and produce a dog with both white and black fur.

B. A purple flowerd tree and a white flower tree mate and produce a pink flowerd tree.

C. A sheep with white fur and a sheep with black fur mate and produce a sheep with gray fur.

D. A person with blue eyes and a person with brown eyes mate and have a child with brown eyes.