It can be inferred from the passage that the author's conclusion that Einstein's approach is "erroneous" might have to be modified because A. it is theoretically possible to generate plausible theories with hidden parameters within them B. some experimental tests of Einstein's theory do not disconfirm the hidden-parameter theory of quantum mechanics C. it is possible for a theory to have hidden parameters and yet be probabilistic D. traditional quantum mechanics has not yet been used to analyze all of the phenomena to which it could be applied E. there are too many possible hidden parameters to develop meaningful tests of hidden-parameter theories