Final answer:
The ethical principle that stipulates 'doing no harm' is nonmaleficence, which is critical in healthcare and medical research to avoid causing unnecessary harm.
Option B.
Step-by-step explanation:
The ethical principle that requires "doing no harm" is known as nonmaleficence.
This principle is a keystone in the moral framework of healthcare and medical ethics. When healthcare providers follow nonmaleficence, they are committing to avoid causing unnecessary harm to their patients.
Similarly, in research trials involving human subjects, nonmaleficence ensures that trials are carefully designed to minimize potential harms to participants.
Learn more about Nonmaleficence here: