The correct option is C where you're currently put up
An adverb clause is a group of words containing a subject and a verb, and it functions as an adverb, by modifying an adjective, verb or an adverb. Adverb clauses generally begin with a subordinate conjunction (since, because, while, etc.)
Option C is correct because it is an adverb clause of place, "where" refers to place and it has the subject "you" and verb "are" ('you're' is a contraction of 'you are').
Option A is incorrect because it is a proper noun, not a clause.
Option B is incorrect because it is a phrase.
Option D is incorrect because the answer lies in C.