The purpose of middle range theory is best described as:

The purpose of middle range theory is indeed best described as addressing specific phenomena using limited concepts. Middle range theories are designed to focus on specific aspects or phenomena, bridging the gap between grand theories and empirical observations. They are more practical and applicable to real-world situations than broad theories, as they provide insights that can be tested and used in practice.

These theories usually involve a limited set of variables and are often created to explain particular behaviors, events, or processes within a defined context. This specificity allows for more manageable and testable hypotheses, making it easier to apply them in research and practice settings. By concentrating on particular phenomena, middle range theories contribute significantly to the development of knowledge in a field while remaining grounded in observable realities.