An Infant Is Lying in a Crib Watching and Listening

An infant is lying in a crib watching and listening to a colorful mobile. What is the purpose of having a mobile?

A) Provides stimulation necessary for continued growth and development for the infant
B) Provides too much stimulation for the infant, making it difficult for the infant to focus
C) Serves as inadequate stimulation for the infant because it is an inanimate object
D) Serves as a distractor for the infant, making it easier to fall asleep