Business-To-Business Advertising Agencies Charge Their Clients Service Fees Because

Business-to-business advertising agencies charge their clients service fees because:

A) the standard agency commission does not cover agency costs.
B) business-to-business advertising is regulated by the Federal Trade Commission.
C) a fee system has a long historical pedigree.
D) the commission rate on industrial media is only 5 percent.
E) unlike a commission system, a fee system involves no negotiations at all.