question: Q:What is the major difference between classical and operant conditioning?? 
  A:Operant conditioning was established well before classical conditioning.;B:Classical conditioning involves pairing stimuli, and operant conditioning involves pairing a response with a stimulus.;C:Operant conditioning is used to train organisms to perform specific acts, and classical conditioning is used to get organisms to stop performing specific acts.;D:Classical conditioning is more difficult to use but more effective than operant conditioning.