The Study by Ambady and Rosenthal (1993), in Which Participants

The study by Ambady and Rosenthal (1993) , in which participants watched brief clips of teachers giving a class lecture, showed which of the following?

A) Participants were not able to accurately predict the teachers' end-of-semester course evaluations.
B) Participants who watched a silent, hour long video of a professor's lecture were able to predict the professor's end-of-semester course evaluations.
C) Participants who watched a silent, 30-second long video of a professor's lecture were able to predict the professor's end-of-semester course evaluations.
D) Participants who watched an hour long video, with sound, of a professor's lecture were able to predict the professor's end-of-semester course evaluations.