The correct option is A the two factors for the same trait separate in the product
Law of segregation states that the two factors for a trait, present together in a heterozygous individual (for example Tt), do not get mixed and are separated during gametogenesis. Thus, each gamete receives one allele for a trait and two types of gametes are formed; 50% gametes carry factor for dominance (T) and 50% carry the recessive factor (t).
So, the correct answer is 'the two factors for the same trait separate in the product'.