题目内容：
There are three characteristics of the communication revolution that have profound implications for health communication, education, and promotion, in transforming how we access and act on health information. They are: 1）Proliferation of Platforms；2）（）；and 3）Greater Grassroots Participation.
A.More information sharing
B.Less grassroots involvement
C.More cencorship of information
D.Less Gate-keeping
参考答案：