Pea plants are tall if they have the genotype TT or Tt, and they are short if they have genotype tt. A tall plant is mated with a short plant. Which outcome below would indicate that the tall parent plant was heterozygous?

AAll of the offspring are short.

BAll of the offspring are tall.

CThe ratio of tall offspring to short offspring is 3:1.

DThe ratio of tall offspring to short offspring is 1:1.

EThere is not enough information to answer the question.