Which word in the sentence is a noun? the music they’re playing is loud. a. they’re b. playing c. loud d. music

A "They're" is "they are" which is a clause-- nowhere near a noun.

B "Playing" is a verb.

C "Loud" describes a noun, music, so it is an adjective.

D "Music" is a noun because it falls in the category of "idea, place, thing".

I hope that helped.

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