A researcher is conducting the study upon eating disorders. Using a list of recent participants in online Weight Watchers program, she randomly chooses a name from the alphabetized list. She then chooses every tenth person from that point on to include in her study. What is this sampling plan and example of?
A. Judgmental Sampling
B. Random Sampling
C. Systematic Sampling
D. Stratified Sampling
E. Cluster Sampling