If the change in the value of g at a height h above the surface of the earth is the same as at a depth \[X\] below it when both \[X\] and h are much smaller than the radius of the earth, then

• A.  \[x=h\]                                               
• B.  \[x=2h\]  
• C.  \[x=\frac{h}{2}\]            
• D.                         \[x=\frac{h}{3}\]