Final Answer:
They are very limited in scope and are confined to one to three concepts. Therefore option A is correct.
Explanation:
Middle-range theories in nursing typically encompass a focused scope, concentrating on one to three core concepts within a specific context or area of practice. These theories aim to bridge the gap between grand theories (which are broad and abstract) and empirical practice by offering more precise explanations and frameworks that can be directly applied in nursing practice and research.
Firstly, middle-range theories are designed to address specific phenomena or issues within nursing, allowing for a more practical application compared to broader theoretical frameworks. This targeted focus enables nurses to apply these theories directly to their practice, enhancing patient care and outcomes.
Secondly, by concentrating on a limited number of concepts, these theories remain manageable and applicable in various healthcare settings without becoming overly complex or unwieldy.
Lastly, while they might not encompass the entirety of nursing's metaparadigm, middle-range theories often incorporate essential elements of nursing practice, thereby integrating both theory and research for practical implementation. Thus option A is correct.