Answer: (C) Experience sampling method
Explanation:
The experience sampling method is one of the type of diary method which is used by the research methodology which is used to make a report on the participate about their feelings, ideas, and thoughts.
The experience sampling method is basically defined as the EMA (Ecological methodology assessment) and it is developed by the Larson. According to the question, the researcher used the experience sampling method.
Therefore, Option (C) is correct.