As head of sales for your firm, one of your key supervisionrelated responsibilities is determining an optimal span of control. You consider all of the following factors except:

d. How much each salesperson is paid

Explanation:

Determining optimal span of control revolves around making sure that each of the members in sales team have all the necessary skills that suitable to their customers.

In business, salesperson most likely paid based on the omission that they made from the deals that they close. It's considered as an incentives to influence the sales team to work harder for their personal gain, not determining optimal span.

c.

clarify customers’ doubts only when asked.