Final answer:
The relationships among nursing, patients, health, and the environment are the basis for nursing theories.
Step-by-step explanation:
The relationships among nursing, patients, health, and the environment are the basis for A. Nursing theories. Nursing theories are frameworks that guide the practice of nursing and encompass concepts such as the nurse-patient relationship, promoting health, and providing care in various settings. They provide a foundation for understanding and addressing the complex interactions between nurses, patients, their health, and the environment they are in.