Researchers are studying the way plants move in response to stimuli. which scenario could be used to test phototropism? a) two sets of plants could be placed in a dark room and the growth monitored. b) two sets of plants could be placed in a lighted room and the growth monitored. c) one set of plants could be placed in a lighted room and one set in a dark room; plant growth is monitored. d) one set of plants could be placed in a room with a light on the right side and one set in a room with a light on the left side; plant growth is monitored