Epistemic communities are transnational communities of experts and policy makers concerned with particular issues.

The answer to what concerned epistemic communities more is environmental issues. Epistemic communities, their value, and effect on transboundary issues are highly prejudiced by the work of Peter M. Haas' Introduction: epistemic communities and international policy coordination.  The occurrence of epistemic communities came to be by the demanding complex issues existing to decision makers.

the answer might be either a or c. can't be too sure , because i searched the web, but no valid answers came through.

i believe that the answer to the question provided above is that the role of campaign committees is to act as a bridge between state and local campaigns.