Rebekah Has Volunteered for a Study to Earn Extra Credit

Rebekah has volunteered for a study to earn extra credit for her sociology class. All Rebekah knows is that the study is examining eating habits and social engagement. Rebekah answers a variety of questions regarding herself, including her typical eating habits and social activities. Rebekah is instructed to continue engaging in her normal habits for the next two weeks with no changes. Rebekah is unaware she has been randomly assigned to the control group of the study. Her data and other participants' data in the control group:

A) receive the experimental manipulation.
B) will be observed directly by the experimenter
C) serve as the baseline for comparison.
D) will serve as outcome data for future random assignment.