Bio question help please!?

The answer is C- 25 %. No matter how many children the couple have, the possible combinations are just three. Lets take the recessive trait to be a small "a" while normal allele by A. Given that both parents are carriers (Aa) as one of their parents where albinos (aa) on both sides - the child can be either a AA (normal), Aa (carrier) and aa (albino) in the ratio 1:2:1, therefore a 25% chance