Greenwald and His Colleagues (1991) Found That Subliminal Learning Tapes

Greenwald and his colleagues (1991) found that subliminal learning tapes did not help participants improve their memory on objective memory tests, though subjectively the participants believed their memory had improved. This experiment:

A) raised doubts about the quality of objective measures of memory.
B) raised questions about the accuracy of reports of personal experience.
C) suggested that people did not realize that their memory may not improve.
D) suggested that participants may have been cheating on the memory tests.