In the figure, the outer equilateral triangle has area 16, the inner equilateral triangle has area 1, and the three trapezoids are congruent. What is the area of one of the trapezoids?
[asy]
size((70));
draw((0,0)--(7.5,13)--(15,0)--(0,0));
draw((1.88,3.25)--(9.45,3.25));
draw((11.2,0)--(7.5,6.5));
draw((9.4,9.7)--(5.6,3.25));
[/asy]
<spanclass=′latex−bold′>(A)</span>3<spanclass=′latex−bold′>(B)</span>4<spanclass=′latex−bold′>(C)</span>5<spanclass=′latex−bold′>(D)</span>6<spanclass=′latex−bold′>(E)</span>7