What Is the Babbling Drift Hypothesis

What is the babbling drift hypothesis?

A) The more one moves up the evolutionary ladder, the more closely the sounds of animal communication resemble those of human spoken language.
B) The sounds produced by babbling infants around the world appear to be drifting toward one universal "language" of babbling.
C) The form of an infant's babbling changes steadily over time and eventually resembles the language the infant hears and soon will speak.
D) While the sounds produced in early babbling are primarily vowel sounds, the sounds of later babbling include both consonants and vowels.