Which of the following statements about news agencies is true?

A、A news agency, also called wire service, or news service, gathers, writes, and distributes news to subscribing news organizations.;
B、All the mass media depend upon the agencies for the bulk of the news except those few that have extensive news-gathering resources of their own.;
C、In Britain the best-known news agencies include the Associated Press and UPI. ;
D、In America the largest news agencies include Reuters, The Press Association and AFX News Ltd.