In the figure the sum of the distances AD and BD is
[asy]
draw((0,0)--(13,0)--(13,4)--(10,4));
draw((12.5,0)--(12.5,.5)--(13,.5));
draw((13,3.5)--(12.5,3.5)--(12.5,4));
label("A", (0,0), S);
label("B", (13,0), SE);
label("C", (13,4), NE);
label("D", (10,4), N);
label("13", (6.5,0), S);
label("4", (13,2), E);
label("3", (11.5,4), N);
[/asy]
<spanclass=′latex−bold′>(A)</span>between 10 and 11<spanclass=′latex−bold′>(B)</span>12<spanclass=′latex−bold′>(C)</span>between 15 and 16<spanclass=′latex−bold′>(D)</span>between 16 and 17<spanclass=′latex−bold′>(E)</span>17