Assertion (A) : In negative reinforcement, the tokens are collected and exchanged for a reward such as an outing for the patient or a treat for the child.
Reason (R) : Modelling is the procedure wherein the client learns to behave in a certain way by observing the behavior of a role model or the therapist who initially acts as the role model.

A is false, R is true

The correct answer is Option 4: A is false, R is true

Assertion (A) : In negative reinforcement, the tokens are collected and exchanged for a reward such as an outing for the patient or a treat for the child. This is false. Negative reinforcement involves the removal of an unpleasant stimulus to increase the likelihood of a behavior being repeated. The description given in the assertion is actually a description of a token economy, which is a system of behavior modification based on the systematic reinforcement of target behavior. The tokens collected and exchanged for a reward reflect positive reinforcement, not negative reinforcement. Thus, the assertion is false.

Reason (R) : Modelling is the procedure wherein the client learns to behave in a certain way by observing the behavior of a role model or the therapist who initially acts as the role model. This is correct. Modelling involves learning through the observation of others, typically a role model. Therefore, the reason is true.