Who is referred to as a "tortfeasor"?

A "tortfeasor" is specifically defined as a person who commits a tort, which is a civil wrong that causes harm or loss to another person, leading to legal liability. This term is central to tort law because it identifies the individual responsible for the wrongdoing that has resulted in injury or damage to another party.

By understanding that a tortfeasor is directly linked to the concept of torts—those wrongful acts that can be the basis for a lawsuit—it becomes clear why this answer is the most accurate. The other choices are not pertinent to the definition of a tortfeasor; lawful acts do not involve torts, legal representatives serve a different role in the legal system, and witnesses provide testimony rather than engage in wrongful conduct. Hence, the essence of the term is encapsulated in the notion of committing a tort, making the identification of a tortfeasor clear and precise.