Salespeople should be evaluated and rewarded only for those activities and outcomes that

A) generate the most income.
B) increase the number of customers.
C) fall under their control.
D) reduce manufacturing costs.
E) cut into competitors' sales.

Evaluating and rewarding salespeople based on activities and outcomes that fall under their control ensures that their compensation is based on their performance and not on external factors like market conditions or competitors' actions. This approach also helps to motivate salespeople to focus on activities that they can directly impact, which can ultimately lead to improved sales results. A and B may not necessarily be directly within the control of the salesperson, and D and E are not relevant to evaluating salespeople's performance.