Social Psychology 9th Edition by David Myers

Exercise 25

Diner and Wallbom (1976) found that when research participants were instructed to stop working on a problem after a bell sounded, 71% continued working when left alone. How many continued to work after the bell if they were made self-aware by working in front of a mirror?
A) 70%
B) 43%
C) 21%
D) 7%