Concept:Political participation means any activity that directly involves citizens in influencing government decisions or election outcomes.
Explanation:Canvassing for votes involves actively campaigning and urging voters to support a candidate or party.
This is a direct political activity because it happens during elections and seeks to shape political leadership.
Membership of a trade union or pressure group can support political goals, but it is not by itself a direct form of political participation.
Organizing a festival for good harvest is a social or cultural activity, not political.
Therefore, the clearest example of political participation among the options is canvassing for votes.
Answer:C. canvassing for votes