The correct option is C Rohini is brave, she fights bravely.
Let's understand what adjectives and adverbs are.
Adjectives are the words that define/explain nouns or pronouns. For example: Roshni is pretty. Here, 'Roshni' is the noun and 'pretty' explains how she is, hence 'pretty' is the adjective.
Adverbs are the words that describe action words (verbs). For example: Ram fought bravely. Here, 'Ram' is the noun and 'fought is the verb. 'Bravely' describes how he fought, hence it is the adverb.
Option A - 'Rohini is bravely, she fights bravely.' Here, 'bravely' is used as an adverb instead of an adjective in the first clause. In the second clause of the sentence, 'bravely' is used correctly as an adverb. Hence, option A is incorrect.
Option B - 'Rohini is brave, she fights brave.' Here, 'brave' is used correctly as an adjective in the first clause of the sentence. However, in the second clause of the sentence, 'brave' is used as an adjective instead of an adverb. Hence, option B is incorrect.
Option D - 'Rohini is bravely, she fights brave.' Here, 'bravely' is incorrectly used as an adverb instead of an adjective in the first clause and 'brave' is incorrectly used as an adjective instead of an adverb in the second clause of the sentence. Hence, option D is incorrect.
Option C - 'Rohini is brave, she fights bravely.' Here, 'brave' is used as an adjective in the first clause of the sentence to describe Rohini, and 'bravely' is used as an adverb in the second clause of the sentence to describe how she fights. Hence, option C is the correct answer.