Dr Martinez Is Studying the Effects of Diet on Mental

Multiple Choice

Dr. Martinez is studying the effects of diet on mental alertness. Each morning for two weeks, participants in Dr. Martinez's study eat a breakfast that is either high in carbohydrates or high in protein. Dr. Martinez then measures the participants' abilities to solve geometry problems. What is the dependent variable in this study?

A) high carbohydrate versus high protein breakfast
B) length of the study (two weeks)
C) ability to solve geometry problems
D) The question does not provide enough information to determine the dependent variable.