Two Masses M and 5M Rest on a Horizontal Frictionless

Multiple Choice

Two masses M and 5M rest on a horizontal frictionless table with a compressed spring of negligible mass between them.When the spring is released,the energy of the spring is shared between the two masses in such a way that

A) M gets 3/5 of the energy.
B) M gets 1/6 of the energy.
C) M gets 1/5 of the energy.
D) M gets 4/5 of the energy.
E) None of these will occur.