The greatest degree of resistance to extinction is typically caused by a schedule of reinforcement. a. variable interval b. variable ratio c. fixed interval d. fixed ratio

The answer is: Variable interval

In a variable interval schedule of reinforcement, reinforcements would be given to the subjects in an unpredictable time schedule.

This means that the subjects can never be sure about whether or not they are going to receive their rewards overtime they do the behavior that the researchers want them to.  Since they do not have a reliable incentives, they will have the greatest degree of resistance to eliminate the behavior.

they can increase to boost the enonomy.