**Core Concept**
Pavlov's experiment is a classic example of classical conditioning, a fundamental concept in behavioral psychology. In classical conditioning, a neutral stimulus is paired with an unconditioned stimulus to elicit an unconditioned response, eventually leading to a conditioned response.

**Why the Correct Answer is Right**
In Pavlov's experiment, he rang a bell (neutral stimulus) every time before presenting food (unconditioned stimulus) to dogs. Initially, the dogs salivated only when they saw or smelled food (unconditioned response). However, after repeated pairings, the dogs began to salivate when they heard the bell alone (conditioned response). This demonstrates the process of classical conditioning, where a previously neutral stimulus (bell) becomes associated with an unconditioned stimulus (food) to elicit a conditioned response (salivation).

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Pavlov's experiment is not an example of operant conditioning, which involves learning through reinforcement or punishment of behavior.
**Option B:** This option is incorrect because Pavlov's experiment is not related to the concept of habituation, which refers to the decrease in response to a repeated stimulus.
**Option C:** This option is incorrect because Pavlov's experiment is not an example of social learning theory, which involves learning through observation and imitation of others.

**Clinical Pearl / High-Yield Fact**
Pavlov's experiment highlights the power of classical conditioning in shaping behavior and responses. This concept has been applied in various fields, including psychology, education, and medicine, to understand and modify human behavior.

**Correct Answer:** D. Classical Conditioning