Three Galaxies,each of Mass M = 4

Multiple Choice

Three galaxies,each of mass M = 4.0 *10⁴¹ kg,lie in a plane at the corners of an equilateral triangle with sides of 5.0 * 10²² m length.The magnitude of the force the other two galaxies exert on each galaxy is

A) 4.3 * 10²⁷ N.
B) 6.4 * 10²⁷ N.
C) 7.4*10²⁷ N.
D) 8.6 * 10²⁷ N.
E) 4.3 * 10²⁸ N.