【单选题】By saying 'It will represent a ' watershed moment' in the evolution of the internet as an advertising me-dium' , the trade magazine suggests______.
A.
Google and Yahoo! share advertising revenues with television networks
B.
the success of Google and Yahoo takes a turning-point to online advertising
C.
America's three big television networks play an important role in the development of advertising medium
D.
Google and Yahoo! build up their status in advertising