All the following share one similarity EXCEPT ______.

A．There are too many pages or hyperlinks on the Internet, so people usually use search engine to find a certain site.
B．More than 8 search engines are accused of selling their search engine spots by Commercial Alert.
C．The headquarters of Commercial Alert is in Portland Oregon.
D．The search engines are Web guides.

A．cash in on their important role as Web guides
B．boost their avenue
C．reverse a series of losses
D．have their sites visited by the internet users more