Dr. Jiminez is examining the role of sugar consumption in self-reported levels of anxiety after a physical activity. He developed four treatment conditions, each with a different dose of sugar consumed by the participants. All other dietary consumption was controlled and monitored. All participants participated in each of the four treatment conditions, engaged in the physical activity, and then rated their levels of self-reported anxiety This is an example of a:
a. Correlational Experiment.
b. Between-Subject Experiment.
c. Within-Subject Experiment.
d. Between-Groups Experiment.