Mills and Later Kohler Criticized Thorndike's Puzzle Box Research, by Arguing____

Mills and later Kohler criticized Thorndike's puzzle box research, by arguing____.

A) his research lacked a large enough sample to be significant or valid.
B) the method did not permit animals to engage in trial and error learning and therefore he only found evidence of conscious reasoning.
C) the method only allowed trial and error learning so that is what was found.
D) that Thorndike may have falsified the data and the question was open for debate.