Osteo is relating to bones. like osteoporosis
I believe the answer is B. Details that the narrator states directly in the text
Ethics serve as a guide to moral daily living and helps us judge whether our behavior can be justified. Ethics refers to society's sense of the right way of living our daily lives. It does this by establishing rules, principles, and values on which we can base our conduct.
Of great value; not to be wasted or treated carelessly.