The writer of an autobiography (Option C) is most likely to implement reflection as a research method. Autobiographies are written by individuals about their own lives, experiences, and thoughts. In this type of text, the author often reflects on their personal experiences and emotions, making the use of reflection as a research method highly relevant and common. Autobiographical writing involves self-analysis and personal insights, which are obtained through reflecting on one's own life and experiences. Therefore, reflection is a key element in the research process for writing an autobiography.