What form of terrorism involves eco-related motives and is graded higher than criminal mischief?

The correct answer, ecoterrorism, refers to the use of violence or criminal acts motivated by environmental or ecological concerns. This form of terrorism is typically aimed at protecting the environment or animal rights and is regarded as more serious than mere criminal mischief due to its potential consequences and the intent behind the actions.

Ecoterrorism often involves direct action against organizations or practices perceived as harming the environment, and such acts are intended to achieve political or ideological goals. The distinction is important because ecoterrorism typically carries severe legal penalties and public backlash compared to lesser offenses like criminal mischief, which may involve property damage without the same ideological implications.

Other forms of terrorism listed in the options do not specifically center around ecological issues. Domestic terrorism and international terrorism encompass a wider range of motives, while cyberterrorism focuses on digital threats rather than environmental concerns, emphasizing why ecoterrorism is the most accurate choice in this context.