The diagrams shown represent an investigation concerning the growth of bean plants. The roots of three identical bean plants were each placed through a hole in covered tubes containing water as shown in the diagrams. Nothing was done to plant A. Vaseline was used to cover the upper surface of the leaves of plant B. Vaseline was used to cover the lower surface of plant C. The water level of each tube was marked and the plants were placed together near a window. After 24 hours, I the water level in each tube was measured. Naisoline Vasoline water lavol- A B с Which tube represents the control for this investigation? A. b. c.​