The pea green sofa that used to sit in my collage dorm is now in my office. which is the relative pronoun and what is its function in the a. the relative pronoun is that; it functions as part of the adverb clause. b. the relative pronoun is in; it functions as part of the adjective clause. c. the relative pronoun is in; it functions as part of the adverb clause. d. the relative pronoun is that; it functions as part of the adjective clause.