When you were a child and you first realized that you could use money to buy candy and other treats,what did money become

A)  a secondary reinforcer
B)  an operant reinforcer 
C)  a classical reinforcer
D)  a primary reinforcer

Secondary Reinforcer

An artificial or learned stimulus that gains its reinforcing power through its association with a primary reinforcer, often used in behavior modification programs.

Operant Reinforcer

Operant Reinforcer is any stimulus which strengthens or increases the probability of a specific response by means of reward or punishment following that response.

Classical Reinforcer

An item or stimulus that increases the likelihood of a specific response by being presented after the response occurs in a conditioning process.