Darwin's Experiments on Phototropism Illustrated That ____

Darwin's experiments on phototropism illustrated that ____.

A) plant stems bend away from bright lights
B) signals from plant roots control phototropism
C) an opaque cap placed over a shoot tip will cause a plant to bend toward light, but will inhibit growth
D) a translucent cap placed over a shoot tip will cause a plant to bend toward light, but will inhibit growth
E) a translucent cap placed over a shoot tip will cause a plant to both grow and bend toward light