Two knights of the earth `S_1` and `S_2` are moving in the same orbit. The mass of `S_1` is 4 times the mass of `S_2` which one of the following statements is correct?

Options

A. the time period of `S_1` is 4 times that of `S_2`
B. the potential energies of the Earth and the satellite are equal in the two cases
C. `S_1` and `S_2` are moving with the same speed
D. the Kinetic energies of the satellites are equal