Option C: Nouns are words that name people, things, places,
animals, etc. In the given sentence, 'drinks' is a name for 'a liquid intended for human consumption'.
Hence it's a noun and option C is correct.
Option A: 'Please' is an adverb that is used to make a request.
Option B: 'Yourself' is a pronoun used to refer to a person in the second person point of view.
Option D: 'To' is a preposition that expresses motion in a particular direction.
These words are not nouns and hence A, B and D are wrong.