She began to babel in front of the guests.

Answer: Option A

Babel : a confused noise made by a number of voices.
Quiet : making little or no noise.
Din : a loud, unpleasant, and prolonged noise.
Mourn : feel or show sorrow for the death of (someone), typically by following conventions such as the wearing of black clothes.
Cry : shed tears, typically as an expression of distress, pain, or sorrow.

Antonym of Babel is Quiet