Respuesta :

Heterozygous means that it is one dominant and one recessive gene, and since Tall is the dominant so it would be Tt. It is B. 
SchwarzschildRadius
So,

The allele for tall is dominant, represented by T.  If a genotype is heterozygous, it has one allele each from the dominant and recessive alleles.  The recessive allele is represented by t.  So a tall plant with a heterozygous genotype has a genotype of Tt.

The correct option is B.