What is a genotype?

the ratio of dominant to recessive genes in an individual

an organism’s combination of genes for a trait

an organism’s appearance as a result of its genes

the collection of dominant genes in an organism

Option B, an organism’s combination of genes for a trait

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.

because the light is a great source of energy for the plants to survive. (i hope this )

the answer is cell division : )