A. the allele changed from being dominant to being recessive.

b. the allele became less frequent than the alleles for longer tail lengths.

c. the allele changed from being autosomal to being sex-linked.

d. the allele began to code for long tail lengths instead of the shortest ones.

adding this so you can give away the lol

Explanation:

i think the answer is 95 hope this

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.