According to the Text, One of the Things That Parents

According to the text, one of the things that parents of a child who cannot hear should watch for and encourage is:

A) signs of early vocalizations, such as cooing and babbling
B) walking at an early age
C) a tendency to lie on the back, rather than the stomach, so the child can see more of the surroundings
D) early use of hand signals as a means of communication