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, then (both $x$ and $h$ being much smaller than the radius of the earth)

• A

  $x=h$
• Correct answer
  B

  $x=2xh$
• C

  $x=\frac{h}{2}$
• D

  $x=h^2$

Hence, the correct answer is option: 'B'.