Answer:
Phenotype.
Step-by-step explanation:
Genotype may be defined as the genetic constituent of the organism. Phenotype is the physical appearance of the organism that can be modified by the organism's genotype.
The tall pea plant (TT) and (Tt) constitute the same phenotype as both the genotypes are responsible for the appearance of the tall height of the plants. The phenotype of the plant is controlled by its genotype.
Thus, the correct answer is option (B).