CORRECT answer is An AdverbEach of the options given above belong to a classification of elements in the English Language known as the PARTS of speechLet's look at the definition and example of each part of speech given above: A Nouna word (other than a pronoun) used to identify any of a class of PEOPLE, places, or things ( common noun ), or to name a particular one of these ( proper noun )e.g., Barcelona, cat, John. Madam, bookAn Adjectivewords that describe nouns (or pronouns), i.e., "describing words"e.g., old, green, cheerfulA Conjunctiona word used to connect clauses or sentences or to coordinate words in the same clausee.g., and, but, ifAn adverba word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc.e.g., gently, quite, then, there, lateFrom the above, it is clear that the highlighted word is an adverb Definitions and examples of the other parts of speech: A Pronouna word that can function as a noun phrase used by itself and that refers either to the PARTICIPANTS in the discourse or to someone or something MENTIONED elsewhere in the discoursee.g., I, you, she, it, thisA Verbwords that show an action, occurrence, or state of beinge.g., sing, develop, existA Prepositiona word used to link nouns, pronouns, or phrases to other words within a sentence. They act to connect the people, objects, time and locations of a sentence.e.g., in, at, on, of, toAn Interjectiona word or expression that occurs as an utterance on its own and expresses a spontaneous feeling or reactione.g., Alas!, Bah!, Bless you!, Congrats!