Choose the word that can substitute the given group of words.
Give off gas bubbles

Correct option is B

The correct one-word for the given group of words is (b) Effervescent.
Effervescent means releasing gas bubbles or fizzing, especially in a liquid. Figuratively, it also means lively or bubbly in personality.
Example: The drink was cold and effervescent, perfect for a summer day.
Meanings of the other options:
· (a) Flat: Lacking effervescence or bubbles; dull (बिना बुलबुले, सपाट)
· (c) Buoyant: Tending to float; cheerful (तैरने वाला, खुशमिजाज)
· (d) Effuse: To pour out (बहाना, उंडेलना)