Classical conditioning involves: a) learning that one stimulus predicts an important event. b) studying lists of short nonsense words. c) learning to make responses in order to obtain rewards or avoid punishment. d) studying how to build computers to perform behaviors requiring human intelligence.

C) learning to make responses in order to obtain rewards or avoid punishment.

Explanation:

The classical conditioning is also known as respondent conditioning. The basic assumption of this learning approach is the biological stimulus which provoques a neural stimulus.

Classical conditioning is the cornerstone of behaviorism, which uses this approach in the treatment of different psycological disorders or undesirable habits like smoking.