Yuna Is Talking to Her Three-Month Old Grandson

Multiple Choice

Yuna is talking to her three-month old grandson.She is using a much slower paced speech than what she would use with another adult,and she is also using much more inflection and high-pitched sounds.Why is Yuna speaking this way?

A) Without more information we can only assume that she always speaks like this.
B) She has heard that babies hear high frequency sounds better than low frequency sounds.
C) She is using child-directed speech.
D) She doesn't want her grandson to grow up talking too quickly or low-pitched.