Mendel studied seed color in pea plants, where yellow is dominant to green. If he crossed a pure-breeding yellow seed plant with a pure-breeding green seed plant, and then crossed two of the resulting...

a) Yellow seed plants, all offspring would have yellow seeds
b) Green seed plants, all offspring would have green seeds
c) Yellow seed plants, some offspring would have yellow seeds and some would have green seeds
d) Green seed plants, some offspring would have green seeds and some would have yellow seeds