A Collection of Groups Come Together and Develop a Platform

A collection of groups come together and develop a platform of political goals.They are driven to act together because they lack access to conventional means of political participation.Because they are disadvantaged and excluded from conventional politics,they choose to use tactics that may draw public attention to their issues.How is this most easily defined?

A) interest group
B) protest movement
C) social movement
D) collective action
E) public interest group