Each of the following sentences has a word or phrase underlined. Read the sentences carefully and find which part of speech the underlined word belongs to. Indicate your response on the Answer Sheet accordingly.
He has been working in the Department of Foreign Affairs `underline("since")` 2002. (a) Adverb (b) Adjective (c) Intensifier (d) Noun

Options

A. Adverb
B. Adjective
C. Intensifier
D. Noun