Concept:Kohler is a German psychologist known for his insightful learning theory, which explains how sudden understanding solves problems without trial-and-error.
Explanation:Wolfgang Kohler proposed the 'Theory of Insightful Learning', a type of learning theory.
He conducted experiments with chimpanzees in a room where food was out of reach.
The chimpanzees suddenly used a box and stick to get the food – not by repeated attempts, but by a flash of insight.
This insight is a sudden reorganization of experience, not based on behavior or observation.
It shows that learning can happen all at once when the solution is seen intuitively.
Thus, Kohler's work is directly associated with the theory of learning.
Answer:D. Theory of learning