Which sentence properly uses the word phenotype?

a. each of the homologous chromosomes on the gametes had matching phenotypes, meaning the offspring were the same.

b. the phenotype of each of the offspring was the result of an adaptational trait that them survive in the environment better than their parents did.

c. even though the parent plants had a phenotype of yellow seeds, they produced some offspring with green seeds, indicating they were heterozygous.

d. even though the parent plants had yellow seeds, the second generation proved their phenotype was heterozygous.