If a Marketer Wants to Directly Compare the Effectiveness of an Event

If a marketer wants to directly compare the effectiveness of an event sponsorship with that of traditional advertising efforts, he or she should

A) calculate the number of exposures to the brand at the event and from coverage of the event and decided whether it is comparatively cost effective.
B) compare the money spend sponsoring the event with the amount needed to run traditional advertising over the same time period.
C) compare sales figures in the weeks before and after the event with sales figures preceding and following traditional advertising efforts.
D) compare brand-preference figures in the weeks before and after the event with brand-preference figures preceding and following traditional advertising efforts.