A Blog Is Best Defined As

A blog is best defined as:

A) a web site primarily involved in tracking people's behavior on the Internet.
B) a web site that typically acts as brokers for advertisers and web sites.
C) a smaller version of the banner that often look like an icon and usually provide a link to an advertiser's landing page.
D) a little billboard that spreads across the top or bottom of the web page.
E) a reverse chronological journaling site.