Concept:Drive reduction theory is a theory of motivation, while the other three are theories of learning.
Explanation:The theory of learning to learn, theory of identical elements, and theory of generalization all fall under learning theories. They explain how past learning affects new learning or how similar stimuli trigger the same response.
Drive reduction theory, however, focuses on how internal drives (like hunger or thirst) push a person to act to reduce that drive. It is a motivation theory, not a learning theory.
Hence, it is the odd one out.
Answer:C. Drive reduction theory