In a Binary System Containing Two Neutron Stars, the Objects

In a binary system containing two neutron stars, the objects will ____.

A) radiate orbital energy away as gravitational radiation and move farther apart
B) radiate orbital energy away as gravitational radiation and move closer together
C) exchange mass until their orbital periods become equal
D) exchange mass until they are in synchronous rotation
E) exchange angular momentum, lengthening the period of the pulsar