Which of the Following Individuals Is Using Child-Directed Speech

Which of the following individuals is using child-directed speech?

A) Selma, who is telling her second-grade class to line up to walk to the cafeteria for lunch period
B) Dan, who is discussing political issues with his son
C) Marguerite, who is using exaggerated intonations and high-pitched speech to talk to her young daughter
D) Carlos, who is giving his young son explicit directions how to pour cereal into a bowl