An electron of mass m, initially at rest moves through a certain distance in a uniform electric field in time t. A proton of mass M, also initially at rest, takes time T to move through an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio $\frac{\mathrm{T}}{\mathrm{t}}$ is nearly equal to

• A

  $\frac{2\mathrm{M}}{\mathrm{m}}$

• B

  $\sqrt{\frac{\mathrm{m}}{\mathrm{M}}}$

• C

  $\sqrt{\frac{\mathrm{M}}{\mathrm{m}}}$

• D

  $\frac{\mathrm{M}}{\mathrm{m}}$