In a Single Experiment, Amount of Reward and Type of Reward

Multiple Choice

In a single experiment, amount of reward and type of reward are simultaneously varied. Subjects are randomly assigned to one of three amount-of-reward conditions. Each subject is tested once with one type of reward and once with a second type of reward. What type of design does this study represent?

A) one variable within-subjects
B) one variable between-subjects
C) mixed factorial
D) within-subjects factorial design