A Medical Society placed advertisements in prominent publications in the region costing $20,000. The advertisements provided information about symptoms of diseases and offered practical advice for controlling their immediate effects. The societys accountants estimate that about 75% of the advertising copy was devoted to information about diseases and the remaining advertising was an appeal for funds. Using the physical units method of separating joint costs, how much of the cost of the advertisement should be reported as program costs?

a) $20,000.

b) $15,000.

c) $10,000.

d) $5,000.