Question: A plant scientist is developing a new fertilizer called Hypergrow. She designs an experiment to test whether Hypergrow helps plants grow faster than Supergrow, a fertilizer already on the market. Which of the following should the scientist do with light during the experiment?

  Options: 
 A. Apply the same amount of light to all the plants.
 B. Apply only green light to all the plants.
 C. Flash the lights to simulate a partly cloudy day.
 D. Keep the plants in darkness.
Answer: A