Which Statement Concerning Sherif's Autokinetic Effect Study Is FALSE

Which statement concerning Sherif's autokinetic effect study is FALSE?

A) Participants' estimates of light movement varied significantly during the first session.
B) Participants' estimates of light movement became increasingly similar over consecutive sessions.
C) When participants returned a year later to repeat the experiment, their estimates of light movement were at the group norm.
D) None of the answers is correct.