When Mendel Crossed Yellow-Seeded and Green-Seeded Pea Plants,all the Offspring

When Mendel crossed yellow-seeded and green-seeded pea plants,all the offspring were yellow seeded.When he took these F₁ yellow-seeded plants and crossed them to green-seeded plants,what genotypic ratio was expected?

A) 1:2:1
B) 3:1
C) 1:1
D) 1:1:1:1
E) 1:3