The author of the passage mentions the classical conception of free will primarily in order to A. argue that earlier theories regarding certain brain processes were based on false assumptions B. suggest a possible flaw in the reasoning of neuroscientists conducting the study discussed in the passage C. provide a possible explanation for the unexpected results obtained by neuroscientists D. cast doubt on neuroscientists' conclusions regarding the temporal sequence of brain processes E. indicate the reason that the results of the neuroscientists' study were surprising