Choose the word that can substitute the given group of words.

Give off gas bubbles

Effervescent

The word that can substitute the given group of words is effervescent.

• Buoyant means able to float or rise in a liquid or gas.
• Flat means not sparkling or bubbly.
• Effuse means to spread out or flow out in a gentle or continuous way.

Effervescent means to give off gas bubbles, especially in a way that is lively or sparkling. It is the most appropriate word for the given group of words because it specifically refers to the release of gas bubbles.