Answer:
Option B, an organism’s combination of genes for a trait
Step-by-step explanation:
Genotype is the combination of genes that represents a specific trait. For example if there are two genes "Y" and "y" for color of flower (color is a trait ) of pea plant with "Y" representing Yellow color and "y" representing green color, then the possible genotype pair would be -
YY, Yy, yy. The phenotype of these genotype depends on the dominant gene.