What Is the Difference Between Cooing and Intonation

What is the difference between cooing and intonation?

A) Cooing is an attempt at combining consonant and vowel sounds. Intonation consists of single vowel sounds.
B) Cooing is a string of single vowel sounds made by an infant of approximately two months. Intonation is a form of babbling occurring at about six months.
C) Cooing is a string of single vowel sounds made by an infant of approximately two months. Intonation is the rising and falling variations in pitch.
D) Cooing is the repetition of sounds. Intonation is the rising and falling variations in pitch and is a progression from cooing.