Which Statement About the Use of Directories and Yellow Pages

Which statement about the use of directories and Yellow Pages is most likely true?

A) Yellow Pages advertising is sold on a weekly or monthly basis.
B) Advertising in the Yellow Pages is inexpensive and necessary.
C) The directory industry is shifting toward local search services.
D) Both printed and Internet Yellow Pages are difficult to revise.
E) Less than 2 million telephone directories are published annually.