**Behavioral Modification**

**Core Concept**
The question describes a scenario where a child's behavior is modified by a reward (500 rupees) and subsequently leads to improved academic performance. This illustrates the concept of operant conditioning, a type of learning in which behavior is modified by its consequences, such as rewards or punishments.

**Why the Correct Answer is Right**
Operant conditioning is a fundamental concept in psychology, discovered by B.F. Skinner. In this scenario, the child's behavior (studying well and getting good grades) is reinforced by the reward (500 rupees), leading to an increase in that behavior. This is an example of positive reinforcement, where a desirable behavior is strengthened by a pleasing consequence.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the scenario described does not involve a therapeutic intervention aimed at modifying behavior through punishment or negative reinforcement. The teacher's action is a positive reinforcement, not a punishment.
* **Option B:** This option is incorrect because the scenario does not involve a therapeutic intervention aimed at modifying behavior through token economy, where a child is given tokens or rewards that can be exchanged for privileges or goods.
* **Option C:** This option is incorrect because the scenario does not involve a therapeutic intervention aimed at modifying behavior through social learning, where a child learns new behaviors by observing and imitating others.

**Clinical Pearl / High-Yield Fact**
Operant conditioning is a powerful tool in modifying behavior, and its principles can be applied in various settings, including education and therapy. Understanding operant conditioning can help educators and therapists design effective interventions to promote positive behaviors and improve outcomes.

**Correct Answer: A. Behavioral modification**