$A$ body starts from rest from a distance $R_0$ from the centre of the earth. The velocity acquired by the body when it reaches the surface of the earth will be ($R=$ radius of earth,$M=$ mass of earth).

• A
  $2 GM\left(\frac{1}{R}-\frac{1}{R_0}\right)$
• B
  $\sqrt{2 GM\left(\frac{1}{R}-\frac{1}{R_0}\right)}$
• C
  $GM\left(\frac{1}{R}-\frac{1}{R_0}\right)$
• D
  $2 GM \sqrt{\left(\frac{1}{R}-\frac{1}{R_0}\right)}$