What Is the Best Suggestion for Assessing Sales Force Productivity

What is the best suggestion for assessing sales force productivity?

A) Recognize that frequency of sales calls is the best indicator of success.
B) Realize that sales call frequency must be compared to the profit earned on each account.
C) Recognize that assessing sales force productivity is more"art"than"science."
D) Compare salespeople with others on the sales force who have similarly-sized territories.
E) Compare a salesperson's current productivity with past productivity.