Which of the Following Is a Weakness of Direct Marketing

Which of the following is a weakness of direct marketing?

A) Direct marketing is a low-cost means of reaching the target market.
B) Messages with direct marketing may differ between direct mailings, confusing the target market.
C) Direct marketing is expensive and time consuming to develop and maintain a database.
D) Direct marketing is difficult to get media cooperation.
E) Direct marketing can lead to promotion wars.