The diagram shows the regular hexagon PQRSTUPQRSTUPQRSTU. What is the size of angle UPTUPTUPT?(A) 30∘30^\circ30∘ (B) 45∘45^\circ45∘ (C) 60∘60^\circ60∘ (D) 120∘120^\circ120∘ (E) 150∘150^\circ150∘