If the moon revolving around the earth causes different amounts of light to reflect off of it, then what causes differing light to reflect off of the moon?

Answer choices:
- depress neuronal excitability
 - energy of moving objects
 - The revolution around earth
 - our nearest star
 - a hemisphere is tilted away from the sun
 - focusing a lens
 - flow of electrons
 - that material's properties

 

   The revolution around earth       