Biology

A scientist wants to test the effect of different amounts of sunlight on the growth of tomato plants. She plants three groups of tomato plants and exposes them to different amounts of sunlight: Group A receives 4 hours of sunlight per day, Group B receives 8 hours per day, and Group C receives 12 hours per day. All other conditions, such as water and soil type, are kept the same. After 4 weeks, she measures the height of the plants.

If the scientist included a group of tomato plants that received no sunlight, what would this group be called?