Answer: C.) on an intermittent schedule.
Explanation: In a bid to curtail disruptive or undesirable behavior, the token system may be employed which simply means immediate rewarding of desirable behavior or character shown by with token which could be exchanged for gifts, this idea is to let others emulate the rewarded behavior and shun undesirable characters. However, the token system seems to be a effective, but one's the strategy becomes effective, it is important not to forget the main goal of the system, which is to ensure that individuals portray desirable characteristics when not being monitored, therefore rewarding with tokens should be reduced and only issued on intermittent basis so as not to impede the goal of the system.