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.

Infants typically begin babbling and making simple consonant-vowel sounds around 4-6 months of age, and "muh-muh" or similar sounds are among the easiest for them to produce. Additionally, these sounds may be reinforced by caregivers who respond positively to them and use them in reference to the infant's mother, leading to the word becoming established in the language. The other options (A, C, and D) are not as likely to be factors in the development of the word for mother in different languages.