A quadrilateral is inscribed in a circle. If angles are inscribed in the four arcs cut off by the sides of the quadrilateral, their sum will be:
<spanclass=′latex−bold′>(A)</span>180∘<spanclass=′latex−bold′>(B)</span>540∘<spanclass=′latex−bold′>(C)</span>360∘<spanclass=′latex−bold′>(D)</span>450∘<spanclass=′latex−bold′>(E)</span>1080∘