Participants in a Study Described as Investigating "Aspects of Intelligence

Participants in a study described as investigating "aspects of intelligence and social awareness" completed "intelligence problems" in small groups.Without their knowledge,half of the students were given easy problems,and half were given difficult problems.The students with easy problems finished easily in the allotted time,while the remaining students struggled.After the intelligence problems,the investigators asked students to complete social comparison measures (i.e.,how they rate themselves compared to others) .Participants in this study

A) experienced minimal risk, because students take tests as part of their everyday life.
B) were "at risk," because of the deception.
C) did not face social risk because they were anonymous.
D) did not require debriefing because the investigator described the purpose of the study.