Answer: Option B) principle of segregation.
Explanation:
The principle of segregation is also known as Mendel's 1st law of heredity. It explains how a diploid individual with two different alleles (heterozygous) occupying the same locus on the homologous chromosomes e.g "Rr", would seperate to yield 'R' and 'r'.
Then, the alternative alleles 'R' and 'r' seperated during meiosis would each go randomly to a different gamete to be crossed with other gametes to form a zygote with diploid number as offspring having a different genetic constituent to that of the parents
Thus, the principle of segregation is the answer.