Answer:
C
Step-by-step explanation:
The correct answer would be a genotype that was different from that of both parents.
Let us assume that the allele for height is A (for tall) and a (for short). Homzygous tall plant would have the genotype AA while homzygous short plant would have the genotype aa. Crossing both genotypes:
AA x aa
Aa Aa Aa Aa
All of the offspring, even though have the same phenotype as one of the parents, have unique genotype from either of the parents. While the parents are AA/aa, the offspring are Aa.
The correct option is, therefore, C.