Marketing Vice President of Health Care Services,Inc

marketing vice president of Health Care Services,Inc.,you are in charge of developing an experiment to test the hypothesis that increasing the number of salespeople assigned to a territory will increase sales of health care services in the territory.Which experiment will do this best?

A) Create an incentive program for our sales force based upon individual performance. Use increases in customer satisfaction as your dependent variable and increases in sales performance as your independent variable.
B) Select three degrees of service health care (poor, good, average) as your independent variable and measure customer responses for each grade using the same number of sales representatives in each territory as your dependent variable.
C) Create an incentive program for your salesforce based upon individual performance. Use increases in customer satisfaction as your independent variable and increases in sales performance as your dependent variable.
D) Use a different number of salespeople in three different sales territories as your independent variable and changes in sales of health care services as the dependent variable.
E) Create an incentive program for your salesforce based upon team performance. Use increases in customer satisfaction as your independent variable and increases in sales performance for the team as your dependent variable.