Which of the Following Is a Disadvantage of Using Blogs

Which of the following is a disadvantage of using blogs as a marketing tool?

A) The blogosphere is cluttered and difficult to control.
B) Advertising on a blog is typically expensive and time consuming.
C) Using blogs as a marketing tool offers minimum reach to a target audience.
D) Blogs, when used as a marketing tool, have a low rank in web directories and search engines.
E) Blogs do not provide the kind of personalized approach that today's marketers are looking for.