Based on the information from the passage, which of the following people do you think can benefit most from public relations services

A．public relations play an important role in the entertainment industry
B．all practitioners in public relations are good at persuasion
C．public relations are only popular in advanced countries
D．public relations have not been heard of in developing countries

A．various functions are involved in the work of a public relations practitioner
B．the public' relations activities play a very important role in the political life
C．the entertainment world attaches great importance to public relations activities
D．the field of public relations may cover promotional activities and press conference