When participants were first placed in a dark room alone and asked to estimate the apparent movement of a point of light, individuals were consistent in their own estimates, and these estimates differed greatly from participant to participant. When participants made the same estimates in a group setting, their estimates converged. According to Muzafer Sherif (1936), this happened because conformity occurs when people .
a. feel anonymous in a group.
b. feel uncomfortable and insecure.
c. can use others' behaviors as cues for what's right.
d. can use anonymity to control others.