The correct answer is C) paying taxes.
The other options of the question were A) voting in elections. B) contacting public officials. D) protesting government decisions.
Paying taxes is not a form of political participation.
Political participation is when you actively participate and write to your representatives to ask or demand a solution to a problem. That is why you voted for them. And you follow up on your petition. If nothing happens, you organize demonstrations, go to TV stations, send comments to radio stations or took the streets to protest and make your voice heard.
Paying taxes is your obligation as a citizen. It is not considered to be political participation.