Consider a cross between pea plants. One parent has yellow seeds and the other parent has green seeds.~ If of the 20 offspring, 11 have yellow seeds and 9 have green seeds, what is the most likely genotypes of the parents? 
选项为:A:YY x yy  B:Yy x Yy  C:Yy x yy  D:yy x yy  E:YY x Yy  请回答其中一个选项.