Which One of the Following Best Describes Contemporary Theorists' Perspective

Which one of the following best describes contemporary theorists' perspective on classical conditioning?

A) Cognitive factors, such as mental representations of stimuli and predictions that organisms make, must often be considered in addition to observable stimuli and responses.
B) Despite Pavlov's early findings to the contrary, higher-order conditioning and generalization seldom occur.
C) Classical conditioning typically occurs only in conjunction with operant conditioning; for example, conditioned stimuli elicit conditioned responses only when those responses are followed by reinforcement.
D) Classical conditioning occurs primarily in artificial laboratory conditions; it rarely occurs in more naturalistic, real-life settings.