Millie Is an Ethnographic Researcher Studying the Development of Language

Millie is an ethnographic researcher studying the development of language in young children from bilingual homes. She studies these children in childcare settings in which the child's second language is the language used. She observes the children as a 'visitor' in their classes for the first three months of their emersion in their new school setting. While there she takes down extensive notes in a notebook as she observes. She also often records small brief notes to herself on little green sheets that she keeps separate from her notebook.
-In this scenario, Millie can best be categorized as which of the following types of observer?

A) Active participant observer
B) Privileged, active observer
C) Passive observer
D) Nonformal observer