Eric designs a study to examine drink preferences of university freshmen. He is planning to have all the freshmen who participate in his study drink a cup of coffee and then rate their enjoyment of the coffee; then drink a cup of tea and rate their enjoyment of the tea; and, finally, drink a cup of milk and rate their enjoyment of the milk. Which kind of design is this?

A. concurrent measures
B. posttest only
C. repeated measures
D. pretest/posttest