In the figure, polygons A, E, and F are isosceles right triangles; B, C, and D are squares with sides of length 1; and G is an equilateral triangle. The figure can be folded along its edges to form a polyhedron having the polygons as faces. The volume of this polyhedron is <spanclass=′latex−bold′>(A)</span>1/2<spanclass=′latex−bold′>(B)</span>2/3<spanclass=′latex−bold′>(C)</span>3/4<spanclass=′latex−bold′>(D)</span>5/6<spanclass=′latex−bold′>(E)</span>4/3
[asy]
size(180);
defaultpen(linewidth(.7pt)+fontsize(10pt));draw((-1,1)--(2,1));
draw((-1,0)--(1,0));
draw((-1,1)--(-1,0));
draw((0,-1)--(0,3));
draw((1,2)--(1,0));
draw((-1,1)--(1,1));
draw((0,2)--(1,2));
draw((0,3)--(1,2));
draw((0,-1)--(2,1));
draw((0,-1)--((0,-1) + sqrt(2)*dir(-15)));
draw(((0,-1) + sqrt(2)*dir(-15))--(1,0));label("<spanclass=′latex−bold′>A</span>",foot((0,2),(0,3),(1,2)),SW);
label("<spanclass=′latex−bold′>B</span>",midpoint((0,1)--(1,2)));
label("<spanclass=′latex−bold′>C</span>",midpoint((-1,0)--(0,1)));
label("<spanclass=′latex−bold′>D</span>",midpoint((0,0)--(1,1)));
label("<spanclass=′latex−bold′>E</span>",midpoint((1,0)--(2,1)),NW);
label("<spanclass=′latex−bold′>F</span>",midpoint((0,-1)--(1,0)),NW);
label("<spanclass=′latex−bold′>G</span>",midpoint((0,-1)--(1,0)),2SE);[/asy]