A necessary ingredient for all tort liability is that the action in question ______________ another person or group of people.

The necessary ingredient for all tort liability is that the action in question harms another person or group of people. Tort law is fundamentally concerned with providing remedies to individuals who have suffered losses or damages due to the wrongful acts of others. This harm can manifest in various forms, such as physical injury, emotional distress, or financial loss, and is essential in establishing that a tort has occurred.

For an individual to be held liable in tort law, it must be demonstrated that their actions directly caused harm to someone else—a key element that differentiates torts from other legal concepts. The requirement of harm ensures that the legal system only addresses genuine grievances and provides recourse to those who have been wronged.

In contrast, options like assists, affects, or threatens do not capture this essential requirement of causing harm. While these terms might describe interactions or implications of actions, they lack the specificity needed to establish tort liability. Therefore, harm is the critical factor that underpins the concept of tort liability in the legal framework.