If G1, G2, G3 are the centroids of the triangular faces OBC, OCA, OAB of a tetrahedron OABC. If λ be the ratio of the volume of the tetrahedron to the volume of the parallelepiped with OG1, OG2, OG3 as coterminus edges, the λ =
(a) 9/4
(b) 4/9
(c) 1/6
(d) None of these
