From a solid sphere of mass M and radius R, a spherical portion of radius R/2 is removed, as shown in the figure Taking gravitational potential `V =0at r = oo,` the potential at (G = gravitational constatn)
A. `-(GM)/(R)`
B. `-(2GM)/(3R)`
C. `-(2GM)/(R)`
D. `(-GM)/(2R)`
