When a grassroots organization desires immediate attention and action for their issue,which of the following is an example of an effective tactic?

A) direct mail campaign to raise funds
B) handing out pamphlets on the street corner
C) unannounced visit to the mayor's office
D) a series of YouTube videos

An unannounced visit to the mayor's office can be an effective tactic for getting immediate attention and action for an issue. It shows that the organization is serious and committed to their cause, and it puts pressure on the mayor to address their concerns. Direct mail campaigns, handing out pamphlets, and YouTube videos may be effective in spreading awareness of the issue, but they may not necessarily result in immediate action.