In a study, the researcher tries to use sugar intake to predict an individual's weight. However, when the researcher adds another variable (exercise) into the study, he finds out that the effect of sugar intake on weight has decreased. Which of the following statement can be true?

Group of answer choices

Exercise is a mediator.

Exercise is a suppressor.

Exercise doesn't have effects on individuals' weight

All the statements are correct.

All the statements are incorrect.