Genetics
In genetics, many phenomena can occur that can be observed through the characteristics of individuals.
One of these phenomena is codominance. Codominance occurs when two alleles express your trait at the same time. That is, alleles are expressed when they are heterozygous.
In the image that the exercise presents, we see a flower that has pink and white spots, this is because there is an expression of the characteristics of the two alleles.
So the answer is option "C".