Which example could be evidence for an organism's growth being influenced by the organism's genes?

Question

A.
A hamster species can be made smaller by mating together only small hamsters.
B.
A cat that eats more food will grow to be larger than a cat that eat less food.
C.
Orchids grown in a greenhouse are smaller than orchids grown in the wild.
D.
Vegetation grows at different rates depending on the available water supply.

Answer 1

A. A hamster species can be made smaller by mating together only small hamsters.

This example indicates that the size of the hamsters is being influenced by their genetic traits, as selective breeding can lead to a change in the average size of the offspring.