Which of the Following Is a Potential Problem with the Objective/task

Which of the following is a potential problem with the objective/task method of setting a budget?

A) It does not permit the quick and ready measurement of the success of an ad campaign.
B) It assumes that marketing activities result from demand.
C) It requires determining in advance the amount of money needed to reach a specific goal.
D) It assumes a static external environment and renders marketing strategies inflexible.
E) It is rarely used by major advertisers and is therefore unfamiliar and alienating to consumers.