The correct answer would be, Experience Sampling.
At these times, the students fill out a brief report about what they are doing. This is an example of Experience Sampling.
Explanation:
Experience Sampling is also called as the Daily Diary Method. In this method, the participants are asked to write down about their feelings, thoughts, behaviors and environments on multiple occasions or at multiple times.
For example, as given in the question, when a psychologist wants to examine the daily fluctuations in moods of people, he asked the participants to write their report and tell what they are doing, whenever he beeps their pagers. So basically he is using the experience sampling and in this way, he would be able to know the routines of participants and the also the factors that could affect their moods.
Learn more about Experience Sampling at:
https://brainly.com/question/7148276
https://brainly.com/question/7457465
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