Which of the following is an example of domestic terrorism?

Domestic terrorism refers to acts of violence committed by individuals or groups based on domestic motivations and directed against their fellow citizens or the government. In this context, a U.S. citizen committing an act of violence against fellow citizens embodies the definition, as it involves individuals operating within the United States, targeting others within the same society.

This action is motivated by various factors, such as political ideologies, social issues, or racial grievances, and it occurs within the national borders. The act not only threatens the immediate victims but also instills fear within the broader community, which aligns with the objectives of terrorism—creating unrest and disrupting societal peace.

The other choices involve either foreign elements or actions that do not directly represent violent acts against citizens; hence, they are not considered domestic terrorism.