Which of the following conclusions is supported by the research of Frits Went and Charles and Francis Darwin on shoot responses to light?

A)When shoots are exposed to light, a chemical substance migrates toward the light.
B)Agar contains a chemical substance that mimics a plant hormone.
C)A chemical substance involved in shoot bending is produced in shoot tips.
D)Once shoot tips have been cut, normal growth cannot be induced.
E)Light stimulates the synthesis of a plant hormone that responds to light.