How Might a Book Publisher Use Blogs in Its Marketing

How might a book publisher use blogs in its marketing research efforts?

A) As a place to report marketing research results to top management.
B) As a source of reviews of its latest releases.
C) As a location for holding online focus groups about its books.
D) As a location for conducting online experiments about book purchasing patterns.
E) As a substitute for large-scale surveys about future book topics.