In the given sentence('Light snow fell for two hours'), the correct part of speech used in the word 'light' is an adjective as it functions to qualify the noun 'snow' in the sentence. The Adjectives are primarily described itself as the part of speech that functions to describe, modify, identify, or qualify a noun or a pronoun in the sentence. It helps in adding detail to the sentence by providing information about the subject or object in the sentence. Thus, <u>option D</u> is the correct answer.
