Which of the following analytical statements is most authentic regarding the nature and control of stimulus and response among Thorndike's 'Trial and Error' theory, Pavlov's 'Classical Conditioning', and Skinner's 'Operant Conditioning'?

In both Thorndike's 'Trial and Error' and Pavlov's 'Classical Conditioning', the stimulus comes first and elicits the response (S-R theory). In contrast, in B.F. Skinner's 'Operant Conditioning', the organism voluntarily emits the response (R-S theory), and behavior is controlled by its consequences (reinforcement).