"He's a jerk," demonstrates the use of a purr word

What has been the response of authoritarian governments toward social networking sites during tense moments within their countries?

A) increased use of sites to promote their cause B) no response because the Internet is impossible to regulate C) attempts to block access D) purchasing advertising to counter opposing views

A

s a faulty research approach because not everyone has a chance of being selected to participate in the research project; the sample is localized to one area. Fill in the blank(s) with the appropriate word(s).