One Reason Why "Muh-Muh" (Or Something Similar) Is the Word

Multiple Choice

One reason why "muh-muh" (or something similar) is the word for mother in so many languages is that

A) infants frequently hear that sound from adults during the first 2 months of life.
B) it is easy for infants to make that sound.
C) the sound "muh" is the opposite of a crying sound.
D) the sound "muh" is very similar to a crying sound.