I believe the answer is C but I’m not completely sure
The amniotic egg is a characteristic of both B and C. Both reptiles and birds have the characteristic of the amniotic egg.
A dihybrid cross is defined as a breeding experiment involving parental generation chromosomes that have two contrasting traits. The individual organisms involved in this can be either homozygous or heterozygous.
This kind of cross pollination experiments led to the development of George Handel's Law of Independent Assortment.
Hope it helps.
