Which act is a conventional form of political participation? making a campaign donation to a candidate the political sabotage of a rival candidate signing petitions against a legislation staging demonstrations or protests

The answer is making a campaign donation to a candidate

A political participation is considered as conventional if it's conducted in the manner that considered as 'acceptable' by most people in society. (such as voting and making donation)

A political participation could be considered as Unconventional if it's considered Hostile and inappropriate even though it's still considered as legal.
(such as demonstration or creating a hit piece article on other candidates)