Why Is Classical Conditioning Considered a Form of Implicit Memory

Multiple Choice

Why is classical conditioning considered a form of implicit memory?

A) Because you have to make an effort to learn the association between the neutral and conditioned stimulus.
B) Because it is based on motor skills like procedural memory is.
C) Because it is involves learning an association without being aware of the reasons behind it.
D) Because it usually involves memory for the episode in which it occurred.