Answer:
c. Token economy
Explanation:
Token economy: In psychology, the term token economy s defined as a reward system that is being used by the psychotherapists and psychologists to modify a particular or it is being used in various behavior modification programs.
The token economy includes the process of providing different tangible rewards to the clients, for example, food, tokens, or stickers to gain positive behaviors. Token economy enforces a desirable behavior.
In the question above, the statement signifies the use of the token economy.