Final answer:
The advantage of using diaries in quantitative research is that they capture the unique thoughts, feelings, and experiences of individuals, which corresponds to option c).
Step-by-step explanation:
The question pertains to the use of diaries in quantitative research. An advantage of using diaries is that they can provide insight into the unique thoughts, feelings, and experiences of respondents, which aligns with option c) They highlight the thoughts, feelings, and experiences that are unique to each respondent. While diaries can indeed elicit sensitive data and are often a source of qualitative data (qualitative information), the specific advantage mentioned in option c reflects their capacity to capture detailed, individual responses that may not be as readily obtained through other quantitative methods such as structured questionnaires.