Which of the following could be evidence that an organism's growth is influenced by the organism's genes?

(Hint: Identical twins have identical genes. Non-identical twins have about half the same genes.)

A] An obese person is more likely to have friends who are obese.
B] The identical twin who receives better nutrition in the womb tends to weigh more at birth.
C] Identical twins are more likely to be about the same height than non-identical twins.
D] A dog breed can be made smaller by breeding together only the smallest dogs.