An experimenter had participants exercise much, a little, or not at all and then measured how much they ate at dinner two hours later. What was the dependent variable in this experiment?

A) the delay between exercise and dinner
B) the amount of exercise
C) the type of food offered
D) the amount of food eaten

The dependent variable is the variable that is being measured or tested, which changes in response to the independent variable. In this experiment, the independent variable is the amount of exercise and the dependent variable is the amount of food eaten at dinner two hours later. Therefore, the correct answer is D, the amount of food eaten.