Reinforcement is provided by any factor that increases the probability that a response will be repeated. Which of the following can be factors of reinforcement?

Anything that raises the chance of a response recurring is a reinforcer, so praise, tokens and success all qualify.

Praise is a social reinforcer, using approval and recognition to strengthen the desired behaviour.

A token reward is a symbolic reinforcer, later exchangeable for a valued item, as in a token economy.

Simply succeeding at a task is an intrinsic reinforcer, the satisfaction of mastery itself.

Since each of the three increases response probability, none can be excluded as a reinforcing factor.

This rests on Skinner's operant conditioning, where positive reinforcement makes a preceding behaviour more likely.