Nine-Month-Old Baby Luke and Ten-Month-Old Baby Simone Are Sitting in the Play

Multiple Choice

Nine-month-old Baby Luke and ten-month-old Baby Simone are sitting in the play area together at the day care center.They smile at each other and present and accept toys from each other.This behavior is called

A) modeling.
B) infant sociability.
C) reciprocal socialization.
D) the mutual regulation model.