Recall That Rosenthal and Jacobson (1968) Told Teachers That Some

Recall that Rosenthal and Jacobson (1968) told teachers that some of their students were "bloomers." Consequently, those students actually performed better than students who were not labeled as bloomers.This finding suggests that

A) the bloomers really were better students than their peers.
B) the teachers were motivated to prove that the researchers were right.
C) the teachers were motivated to reward bloomers and punish the others.
D) teachers' expectations were powerful in influencing the bloomers' behaviors.