Which of the Following Problems Is a Manager Most Likely

Which of the following problems is a manager most likely to face if he uses sales as a measure of advertising effectiveness?

A) Sales results offer little guidance or direction to those responsible for planning and developing the advertising program.
B) There is a short, often immeasurable, time period between when advertising is run and when sales actually occur.
C) Sales results are affected by no marketing-mix variable other than price and promotion.
D) No internal-environmental variables have any significant influence on sales results.
E) Sales are generally not considered a good indicator for an IMC program.