All but One of the Following Experiments Would Allow a Scientist

All but one of the following experiments would allow a scientist to discover if the phenotype of an organism would be affected by environmental changes.Choose the experiment that would NOT show environmental effects.

A) Cuttings are taken from an English Ivy plant and are then grown in soils with different pH levels.
B) A Siamese cat has patches of fur removed from its hips and an ice pack is secured over the area.
C) A mouse with the genetic disorder phenylketonuria (PKU) is fed a diet low in phenylalanine for a year and then changed to a diet rich in the same molecule.
D) A group of mice that show the same dominant trait are fed a variety of identical diets to determine if they show different body types.
E) A hydrangea is grown for one year in aluminum-poor soil and then grown for one year in aluminum-rich soil.