Final answer:
Naturalism and natural law theory are related concepts, but they are not the same. The core concept of natural law theory is that it is a system of justice believed to be common to all humans and derived from nature rather than from societal rules or positive law.
Step-by-step explanation:
Naturalism and natural law theory are related concepts, but they are not the same. Naturalism is the belief that only natural laws and forces operate in the universe, while natural law theory is the idea that there is a system of right or justice that is common to all humans and derived from nature. Although some may argue that natural law is essentially naturalism applied to the philosophy of law, advocates of naturalism are not necessarily advocates of natural law, and vice versa.
The core concept of natural law theory, according to Britannica, is that it is a system of justice believed to be common to all humans and derived from nature rather than from societal rules or positive law. Therefore, option B, which states that natural law is a system of justice derived from nature, is the correct answer.