Respuesta :
The treatment in this experiment is d. sugar. It's the most suitable option as others doesn't fit due to the task given below
Answer: a. water
Explanation:
The independent variable is something which can be altered in an experiment the effect of this change can be examined on the dependent or experimental variable. The experimental variable changes with the effect of the independent variable.
The water is the experimental variable in this case. This is because of the fact that the effect of freezing on sugar and plain water is to be determined. Hence, the water is treated in the experiment.