The correct combination of motivation, feedback, and capacity is known as the:

The concept of a "just right challenge" refers to the optimal intersection of three critical elements: motivation, feedback, and capacity. This term emphasizes the balance necessary for effective learning and improvement within a training or performance context.

When motivation is high and aligns with a person's current capacity—what they are able to achieve given their skills and experience—the individual is more likely to engage with the challenge presented. Feedback serves to guide the individual, reinforcing their understanding and encouraging ongoing efforts. This triad creates a supportive and effective learning environment, allowing individuals to stretch their abilities without becoming overwhelmed or discouraged.

In contrast, while terms like "optimal challenge" or "effective training strategy" might share some conceptual similarities, they do not specifically encapsulate the balanced synergy of motivation, feedback, and capacity in the way that "just right challenge" does. The distinction lies in its precise acknowledgment of how these components work together to promote growth and prevent frustration in the learning process.