I'm pretty sure it's an adjective phrase because it's describing where it is clean.<span />
I think the best choice is the last one: <span>d. appropriate length.
. Length is also determined by the purpose of the work and the context in which it will appear. (for examples, some newspaper articles have per-specified length). </span>
I believe it is reference page, or work cited
I hope this helps narrow down
The correct answer is St. Paul the Apostle and the term “Chosen Vessel” is a reference to the New Testament, specifically Acts 9:15 which reads, in King James Bible: “But the Lord said unto him, Go thy way: for he is a chosen vessel unto me, to bear my name before the Gentiles, and kings, and the children of Israel”. St. Paul is the “chosen vessel because he would go “beyond” the Jewish world and convert non-Jewish gentiles to Christianity by carrying the sacred fire of God in his heart and mind, as a vessel.