A tetrahedron with four equilateral triangular faces has a sphere inscribed within it and a sphere circumscribed about it. For each of the four faces, there is a sphere tangent externally to the face at its center and to the circumscribed sphere. A point P is selected at random inside the circumscribed sphere. The probability that P lies inside one of the five small spheres is closest to
<spanclass=′latex−bold′>(A)</span>0<spanclass=′latex−bold′>(B)</span>0.1<spanclass=′latex−bold′>(C)</span>0.2<spanclass=′latex−bold′>(D)</span>0.3<spanclass=′latex−bold′>(E)</span>0.4