Nathaniel Is Designing an Experiment: He Wants to Learn How

Nathaniel is designing an experiment: He wants to learn how much time other students at his college spend studying for their art history exams. He decides to use a self-report survey, but he knows that people might over- or under-report their study time due to

A) the hindsight bias.
B) random assignment.
C) placebo effects.
D) the social desirability bias.