In personal selling, costs of promoting a product or service can be controlled by:
a.
purchasing advertising and sales promotions in large amounts.
b.
promoting undifferentiated sales messages toward prospective consumers.
c.
promoting a product to both qualified and nonqualified prospects.
d.
adjusting the size of the sales force in one-person increments.
Answer: d.
adjusting the size of the sales force in one-person increments.