If the constant of gravitation \[(G)\], Planck's constant \[(h)\] and the velocity of light \[(c)\] be chosen as fundamental units. The dimension of the radius of gyration is [AMU (Eng.) 1999]

• A.             \[{{h}^{1/2}}{{c}^{-3/2}}{{G}^{1/2}}\]
• B.                      \[{{h}^{1/2}}{{c}^{3/2}}{{G}^{1/2}}\]
• C.             \[{{h}^{1/2}}{{c}^{-3/2}}{{G}^{-1/2}}\]       
• D.             \[{{h}^{-1/2}}{{c}^{-3/2}}{{G}^{1/2}}\]