The students exposed five pea plants to various colors of light for a period of three weeks. In the investigation, the plants were placed in the same amount of soil and given the same water.Which statement best
explains the purpose of Plant 4?

A It ensures that the hypothesis will be correct.

B It adds an independent variable to the experiment.

C It provides more accurate data to include in a lab report.

D It is the control group and serves as the basis for comparison


Plzzzzz help