We want to see how changing the amount of sunlight a plant receives affects its growth. if one plant gets the normal amount of sunlight, we would call this plant the

Control

Explanation:

A scientific control represents an experimental condition that scientists set up to be able to properly interpret their results. A control is used to minimize variation in the results.

For example, in this experiment studying plant growth, it could have been particularly cloudy during the experiment, meaning sunlight might have been unusually low. If we didn't have the control, we wouldn't be able to tell if any changes in growth were a result of the cloudiness, or because of what we did during our experiment. Having a "normal" control allows us to compare our results within the experiment.

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.