The Moon Orbits the Earth with a Period of About $( 1 / \sqrt { 16 } ) \times 28$

The Moon orbits the Earth with a period of about 28 days. The two bodies are separated by a distance ~ 250,000 miles. An Earth satellite at a distance ~125,000 miles would have a period (in days) of

A) $( 1 / \sqrt { 16 } ) \times 28$ days.
B) $( 1 / \sqrt { 8 } ) \times 28$ days.
C) $( 1 / \sqrt { 4 } ) \times 28$ days.
D) $( 1 / \sqrt { 2 } ) \times 28$ days.