In guinea pigs, smooth coat $(S)$ is dominant over rough coat $(s),$ and black coat $(B)$ is dominant over white coat $(b) .$ In the cross $S s B b \times S s B b,$ how many of the offspring will have a smooth black coat, on average?
a. 1$/ 4$
b. about 9$/ 16$
C. 1$/ 16$
d. 6$/ 16$
e. 2$/ 6$