In the context of learning theories, while making a detailed micro-analysis of the philosophical, functional, and motivating nature of Edward Thorndike's 'Trial and Error Theory', Ivan Pavlov's 'Classical Conditioning Theory', and B.F. Skinner's 'Operant Conditioning Theory', which of the following statements most accurately defines the real and scientific difference among these three theories?

Thorndike's theory involves the 'trial and error' performed by the cat and the primary role of the law of effect. In Pavlov's classical conditioning, a conditioned stimulus (bell) is paired with an unconditioned stimulus (food) to elicit a conditioned response (salivation), which is of the S-R type. In contrast, B.F. Skinner's 'Operant Conditioning' is based on the premise that an organism acts voluntarily and the consequences (reinforcement) determine whether that behavior will be repeated or not, which is called the 'R-S' (Response-Stimulus) paradigm.