In a Research Study, the Researcher Sits at a Table

In a research study, the researcher sits at a table on the side of the school's lunchroom while the children have their lunch break. The researcher records the interactions that he sees between the children and the school staff. What form of observation is the researcher engaged in?

A) A changing observational role
B) A "day-in-life" observational role
C) A nonparticipant observational role
D) A participant observational role