Knowing that the acceleration due to gravity on the Earth surface is $$g$$ and the radius of the Earth is $$R$$, a small body of mass $$m$$ falls on the Earth from a height $$h = \frac{R}{5}$$ above the Earth's surface. During the freefall, the potential energy of the falling body decreases by

A

$$mgh$$

B

$$\frac{4}{5}mgh$$

C

$$\frac{5}{6}mgh$$

D

$$\frac{6}{7}mgh$$