Answer: a. Sales offer little guidance or direction to those responsible for planning and developing the advertising program.
Step-by-step explanation:
Advertisement is when a particular good.or service is being promoted so as to increase the sales and generate more profit.
Sales is the selling of goods or rendering of a particular service by a business to its consumers.
In this case, the likely problem for a manager who uses sales as a measure of advertising effectiveness will be that sales offer little guidance or direction to those responsible for planning and developing the advertising program. When sales is used to determine how successful an advertising is, it gives little guidance to those in charge of developing the program.