Final answer:
None of the options provided by the student are one of the three basic ethical principles in the Belmont Report; those principles are respect for persons, beneficence, and justice.
Step-by-step explanation:
The three basic ethical principles in the Belmont Report are respect for persons, beneficence, and justice. They serve as the foundation for the conduct of research involving human subjects. The options provided in the student's question (making observations, common sense, proposing a hypothesis, and theory building) are steps or elements of the scientific method.
These are not to be confused with the ethical principles of the Belmont Report. Consequently, the correct answer is that none of the options (a-d) listed by the student corresponds to the three basic ethical principles outlined in the Belmont Report, as they all are related to the scientific inquiry process, not ethical guidelines. Out of the options provided, making observations is not one of the three basic ethical principles in the Belmont Report. Making observations is a research method or technique used in the scientific process, but it is not an ethical principle.