We Can Conclude That Participants in Sheriff's Study Exhibited Private

We can conclude that participants in Sheriff's study exhibited private conformity rather than public conformity because

A) when retested without their fellow group members,participants reverted to their original estimates.
B) they would report their group's normative estimate when asked to respond aloud,but not when asked to respond in writing.
C) they continued to use their group estimates when retested alone one year later.
D) the task was too easy for people to demonstrate public conformity.