Which of the Following Is True About the Case of Clever

Multiple Choice

Which of the following is true about the case of Clever Hans?

A) it was shown to be a case of scientific fraud
B) Pfungst demonstrated that the most parsimonious explanation was that the horse had a higher level of intelligence than other horses
C) Pfungst ruled out intelligence by showing that if the questioner didn't know the answer, thehorse didn't know the answer
D) he only answered correctly when his trainer (von Osten) knew the answer