The answer is B. even if you fill out a Punnett Square there is still a possibility that it won't come out that way. for example there could be two dominant traits in a Punnett square instead of just one completely dominant trait. like BB and BB.
b all possible combinations of gametes based on a cross between the two parents
Explanation:
The square of punnet is a visual representation of the possibilities for a certain trait of the offspring of two individuals to manifest certain genes, based on the gamete genes of the parents, you create a square that shows all possible combinations of those gametes in order to calculate the probability of a certain gamete being showed in the offspring.
