Answer : Option C) Actually
Explanation : "<em>An adverb is a word or phrase which modifies the meaning of an adjective, verb, or other adverb, expressing manner, place, time, or degree for e.g. gently, here, now, very". </em>There are some adverbs, which are like sentence adverbs,that can be also used to modify the whole sentences.
Here amongst the given options; "Actually" is the word that satisfies the condition of being an adverb as it is modifying the other adverb "really."
Rest all options are a form of adjective.
