A unidirectional force F varying with time t as shown in the Fig. acts on a body initially at rest for a short duration 2T. Then the velocity acquired by the body is

• A

  $\frac{{\mathrm{\pi F}}_0\mathrm{T}}{4\mathrm{m}}$

• B

  $\frac{{\mathrm{\pi F}}_0\mathrm{T}}{2\mathrm{m}}$

• C

  $\frac{{\mathrm{F}}_0\mathrm{T}}{4\mathrm{m}}$

• D

  zero