Courtney Is the Sales Manager of a Company Manufacturing Office

Courtney is the sales manager of a company manufacturing office equipment.She believes that it is possible to increase sales by using reinforcement theory.If Courtney wants to use positive reinforcement to increase sales,she should:

A) end all sales contests and their corresponding awards.
B) allow flextime for all salespeople.
C) stop displaying the "top salesperson of the month" results on the company bulletin board.
D) increase sales commissions.