Which Example Shows That a Teacher Closely Observed Her Children

Which example shows that a teacher closely observed her children?

A) Alva learns that three of her children have a Mexican background.
B) Maja increases the outdoor play time because she notes that her group of children are very active.
C) Emil keeps the story time the same even though many children in his group are good readers.
D) Oscar understands the social ability of most three-year-olds.