Mendel Observed That Dominant Traits

Mendel observed that dominant traits

A) are only expressed in hybrids.
B) were absent in the F₁ generation of pea plants that he used in his experiments.
C) were the only traits seen in the F₂ generation of pea plants in his experiments.
D) are expressed in all plants.
E) are seen in all the F₁ hybrid pea plants in his experiments.