A student designs an experiment to determine the effect of sunlight on plant growth. He or she places three identical plants on three different window sills, which permit different amounts of sunlight exposure. Each plant receives the same amount of water each day. What is the responding variable in this experiment? A. plant growth

B. amount of sunlight

C. amount of water

D. type of plant

The responding variable in this experiment of the students experiment where she places three identical plants on three different window sills which were expose to different amounts of sunlight exposure and same amount of water each day is the amount of sunlight because even the plant receives the same amount of water but each of them didn't expose the same amount of sunlight than the growth of the plant will not be the same.