【单选题】The rise of multinational corporations, global marketing, new communications technologies, and shrinking cultural differences have led to an unparalleled increase in global public relations or PR. Sur...
A.
an unparalleled increase in the number of public relations companies
B.
shrinking cultural differences and new communications technologies
C.
the decreasing number of multinational corporations in the U. S.
D.
increased efforts of other countries in public relations