Select the most appropriate option that can substitute the highlighted word in the given sentence.
Reduced price of cooking gas brought happy to the face of every citizen.

The correct substitution is "happiness".
Explanation:
· The word "happy" is an adjective.
· The sentence requires a noun (because "brought" is a verb).
· "Happiness" (noun form of "happy") fits correctly.
Grammatical rule used:
· A verb (brought) must be followed by a noun (happiness), not an adjective.
Example:
· Incorrect: Winning the match brought happy to the team.
· Correct: Winning the match brought happiness to the team.
Meanings of other options:
· Happily (adverb, incorrect).
· Happier (comparative adjective, incorrect).
· Happiest (superlative adjective, incorrect).