2 plants of the same type were left at the window over a period of 2 days. At the end of the experiment, the water in beaker B was found to have decreased more than the water in beaker A as compared to the original water level as shown below.

                         

The most likely aim of the experiment was to find out if_________.

A、air is needed to produce leaves

B、plants need light to produce food

C、roots transport water throughout the plant

D、the number of leaves affect the absorption of water