How Is Classical Conditioning Different from Operant Conditioning

How is classical conditioning different from operant conditioning?

A) Classical conditioning associates a response with punishment, while operant conditioning links a response with a reward.
B) Classical conditioning associates a voluntary activity with a reward, while operant conditioning links two phenomena that are usually unrelated.
C) Classical conditioning associates instinctive behaviours with punishments, while operant conditioning links learned behaviours with rewards.
D) Classical conditioning associates two phenomena that are usually unrelated, while operant conditioning links a voluntary activity with a reward.