Plants growing in a partially dark environment will grow toward light in a response called phototropism.Which of the following statements is true regarding phototropism?

A)It is caused by an electrical signal.
B)One chemical involved is ethylene.
C)Auxin causes a growth increase on one side of the stem.
D)Auxin causes a decrease in growth on the side of the stem exposed to light.
E)Removing the apical meristem enhances phototropism.