In 1907, a horse named clever hans was said to be able to answer math problems posed to him. he would tap out the correct answers with his hoof. however, an investigation revealed that if clever hans could not see the person asking the question, he did not provide correct answers. what does this suggest?
a : this illustrates the importance of including control groups -- without a second horse, no conclusion can be drawn.
b : clever hans was responding to subtle visual cues from the questioner.
c : clever hans was motivated to answer correctly by social interaction.
d : all of the choices are correct.
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