A Rock Is Moving with Speed V

Multiple Choice

A rock is moving with speed v.If the mass of the rock were tripled and the speed were reduced to v/3,which of the following statements would be true?

A) The kinetic energy of the rock is smaller than in the first case,but the momentum is larger.
B) The kinetic energy of the rock is smaller than in the first case,but the momenta of both are the same.
C) The kinetic energies of the rocks are the same in both cases.
D) The kinetic energy of the rock is 1/9 its previous value.