In Mendel's Pea Plants,how Did He Know That Each F1

Multiple Choice

In Mendel's pea plants,how did he know that each F1 generation contained two alleles encoding different characteristics?

A) The F1 generation had a blended phenotype of the two parental phenotypes.
B) Both parental phenotypes reappeared in the F2 generation.
C) Each F1 plant had a different phenotype.
D) The F1 plants did not have two alleles.
E) none of the above