The Breath Sounds of a Toddler Are Especially Easily Heard

The breath sounds of a toddler are especially easily heard through the stethoscope. Which of the following reasons explains this?

A) The heart makes less competitive noise as it beats.
B) The body is lengthening and adipose tissues are decreasing.
C) The alveoli are more elastic in young children.
D) Children are easily frightened and they breathe more heavily. Children are easily frightened and they breathe more heavily.