The sides of a right triangle are a,a+d, and a+2d, with a and d both positive. The ratio of a to d is:
<spanclass=′latex−bold′>(A)</span>1:3<spanclass=′latex−bold′>(B)</span>1:4<spanclass=′latex−bold′>(C)</span>2:1<spanclass=′latex−bold′>(D)</span>3:1<spanclass=′latex−bold′>(E)</span>3:4