Account Planning Has Become a Very Important and Demanding Function

Account planning has become a very important and demanding function in many agencies because:

A) public relations has replaced advertising to achieve global integrated marketing communications.
B) budgeting services have reduced the redundancy associated with on-task account planning.
C) marketing research has expanded the creative capacity of ad agencies.
D) of the increase in the number of marketing communication channels and ways of contacting consumers.
E) of the reducing roles of account executives.