Question: Jake is testing how light affects plant growth. He grows two plants in identical pots with the same amount of water and fertilizer. Jake grows one of the plants in the sun, and the other in the shade. Which part of Jake's process indicates that there is a control for this investigation?

  Options: 
 A. He is growing plants in identical pots.
 B. He is using the same amount of water.
 C. He is growing one plant out of the sun.
 D. He is using the same amount of fertilizer.
Answer: C