Which of the Following Statements Does NOT Describe an Advantage

Which of the following statements does NOT describe an advantage personal selling has over other forms of promotion?

A) Personal selling is less expensive on a per contact basis.
B) Personal selling is better for providing customers with detailed demonstrations of products.
C) It is easier to direct the marketing effort directly to qualified prospects with personal selling.
D) Personal selling costs can be controlled by adjusting the size of the sales force.