The following sentence has been divided into parts. One of them may contain an error.
She danced happy / on the stage / in the competition held last evening.

Correct option is A

Option (a) contains an error.
“Happy” is an adjective, but it is used to modify the verb “danced,” which requires an adverb. The correct word is “happily.”
Correct sentence: She danced happily on the stage...
Grammatical rule used: Use adverbs to describe how an action is done.
Example: He sang beautifully.
�� Information Booster: Many adverbs are formed by adding -ly to adjectives.