In Robert Rosenthal's Study of the Effects of Expectations, Some

In Robert Rosenthal's study of the effects of expectations, some students were led to believe that the rats they were training were maze-bright and other students were told their rats were maze-dull, although the rats were actually all the same. What did Rosenthal find in the study?

A) The rats labeled bright were found to be much better learners.
B) The students immediately became suspicious of how the rats were labeled.
C) Surprisingly, the rats labeled dull were found to be much better learners.
D) There was no relationship between the way the rats were labeled and whether students found their rats to be good or bad learners.