A Moon Is in Orbit Around Its Mother Planet

Multiple Choice

A moon is in orbit around its mother planet. Which of the following statements is always true about its kinetic energy (K) , and its gravitational potential energy (U) ?

A) K is positive, and U is positive.
B) K is negative, and U is negative.
C) K is positive, and U is negative.
D) K is negative, and U is positive.