The correct option is A.
The law of segregation is a law which govern inheritance in living organisms. This law was formed as a result or the work of a biologist called Mendel. The law states that, allele pairs separates during the process of gamete formation and they are later randomly united at fertilization. Every living organism possess two allele for each trait. Each allele carries a specific trait, which can be dominant or recessive or combination of the two. Any of the genes which carry these traits can be united at fertilization.