Answer:
Riding rides and eating food at a festival.
Explanation:
Observation is one important aspect of investigative journalism. It involves an action that includes not only the sense of sight but also taste, touch, smell, etc.
Among the scenarios given, the use of observation by a reporter will be in the act of joining the rides and eating the food at the festival. This is an observational skill in that the experience will give better aspects to write a report about the festival. Reading the history of the festival, or talking to the organizer or friends is not an aspect of observation.
Thus, the correct answer is the third option.
