Final answer:
The correct answer is C) Qualitative research, which focuses on narrative data and subjective experiences to better understand client perspectives in nursing.
Step-by-step explanation:
The type of research that investigates a question through narrative data, explores the subjective experiences of human beings, and provides nursing with a better understanding of clients' perspectives is C) Qualitative research. Qualitative research involves collecting and analyzing subjective evidence that is often difficult to control and replicate. This may include case studies, thematic structures, and interpretive methods that seek to understand behaviors and experiences through in-depth interviews, focus groups, and analysis of content sources. Unlike quantitative research, qualitative research is less about counting and measuring and more about exploring the depth and range of experiences. It aims to provide insights that can help form an understanding of the context and complexities of the subject matter.