Prince participates in an experiment that requires him to choose a shirt from the shirts kept in the laboratory. After the experiment, Alma, the researcher, explains that the purpose of the study is to identify the correlation between age, gender, and one's attitude toward clothing. In this scenario, Alma disclosing the true purpose of the study to Prince exemplifies the concept of
a. debriefing.
b. sampling.
c. manipulation.
d. replication.