A natural person is defined as?

The correct answer is that a natural person is defined as a human being. In legal terminology, a natural person refers to an individual human being with legal rights and obligations, as opposed to a legal entity such as a corporation or organization. This definition encompasses all individuals regardless of their nationality, place of birth, or beliefs, therefore accurately capturing the essence of what constitutes a natural person.

In contrast, while the first option refers to a person born in the USA, this is too restrictive and does not encompass all natural persons globally, as natural personhood is not limited by citizenship or birthplace. The third option, which suggests that a natural person could be an environmentalist, mischaracterizes the legal definition by implying that a person's beliefs or advocacy work can define their status as a natural person. Legal definitions are more about the inherent qualities of being human rather than one’s ideology or views. The last choice, "None of the above," is incorrect because option B provides the accurate and comprehensive definition needed.