Which of the Statements Below Is Incorrect with Respect to the Lack

Which of the statements below is incorrect with respect to the lack of marketing costs standards?

A) many marketing expenditures work over a period of time, making it difficult to identify sales results in one period with the marketing costs to achieve those sales
B) many marketing expenditures, such as advertising and customer service, have an immediate, readily measurable impact on sales
C) Marketing managers seldom can precisely determine the costs of inputs needed to achieve a desired sales level
D) the marketing outlays needed to produce a given level of sales are much less predictable, because results vary widely depending on the marketing mix selected for changing marketing scenarios