Answer:
C) The Earth-Moon CM follows the orbit around the Sun. Earth and Moon rotate around their CM. The radius of rotation of Moon around the CM is much greater than radius of rotation of Earth around the CM.
Explanation:
At first we assume that both Earth and Moon can be treated as particles, the center of mass of the Earth-Moon system is obtained by using this formula:
(Eq. 1)
Where:
- Location of the center of the Earth, measured in kilometers.
- Location of the Moon, measured in kilometers.
- Location of the center of mass, measured in kilometers.
- Mass of the Earth, measured in kilograms.
- Mass of the Moon, measured in kilograms.
If we know that 
, 
, 
and 
, the location of the center of mass respect to the Earth is:
The Earth has a radius of 
meters, we notice that center of mass in located inside the Earth and the radius of rotation of the Earth around the center of mass is much greater than the radius of rotation of the Moon around the center of mass. That center of mass follows an orbit around the sun.
In consequence, correct answer is C.
