Which of the Following Conclusions Is Supported by the Research

Multiple Choice

Which of the following conclusions is supported by the research of both Peter Boysen-Jensen (1913) and Charles and Francis Darwin (late-1800s) on shoot responses to light?

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