When Erik's parents speak to each other, they talk very fast and connect word sounds to each other to get their thoughts out. Erik seems to be having a hard time processing all that they are saying

What can his parents do to help him start comprehending words and learning the system of their language?
a. They can talk to him in baby talk.
b. They can talk to him in neuro-stimulating speech.
c. They can talk to him in infant-directed speech.
d. They can talk to him in slow-down speech

C. Infant-directed speech will start to show him the separations between words and phrases.