One Child in a Kindergarten Room Had a Slight Fever

One child in a kindergarten room had a slight fever and did not eat lunch.Otherwise,the child seemed OK.Three days later,several children were absent from kindergarten.Which best describes what happened?

A) Another nursery school was offering the same child care at a much lower price
B) Infectious diseases can be contagious before any diagnostic symptoms occur
C) No way to tell; there are many reasons why parents keep children home
D) Parents chose to protect their children from the child with a fever,so they kept their children home for a few days.