Choose the source that would support or defend the following assertion. the cost of sponsoring our bake sale is much less than a radio ad campaign and you will reach just as many people a price-list of the bake sale items a newspaper article exploring alternatives to radio and television advertising a proposal from a local radio station detailing a popular ad plan a website that promotes using fund-raisers as team-building activities for clubs and teams none of the above

C. a proposal from a local radio station detailing a popular ad

Because those holding the bake sale would know how much they are charging sponsors for sponsorships and would also know the number of people who would come into contact with the sponsor information, the information that would be needed is the same information for a radio ad campaign in order to make the comparison.  As such a proposal from a local radio station detailing a popular ad plan would be just the source needed.

a proposal from a local radio station detailing a popular ad

Explanation: got it right on the lesson