What did Pavlov think was necessary for classical conditioning to occur?

Question

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Pavlov believed that classical conditioning occurred when the conditioned stimulus (CS) and unconditioned stimulus (UCS) were presented at nearly the same time, with the CS preceding the UCS by only a brief interval. This is known as temporal contiguity. Positive reinforcement (A) is not necessary for classical conditioning, as the focus is on the relationship between stimuli rather than the presence of a reward. Cognitive understanding of the relationship between stimuli (B) is not necessary either, as classical conditioning can occur even if the individual is not consciously aware of the relationship between the CS and UCS. Physical similarity between the CS and UCS (D) may facilitate learning but is not necessary for conditioning to occur.

What Did Pavlov Think Was Necessary for Classical Conditioning to Occur