Answer :
a. BB because it is black and it is codominate. It is not BW because W is also shown with Black because both are codominate.( has to be homozygous)
b. WW (refer to a)
c. BW because both are shown (codominate )( has to be heterozygous)
b. WW (refer to a)
c. BW because both are shown (codominate )( has to be heterozygous)