A uniform circular disc of radius $50\text{cm}$ at rest is free to turn about an axis which is perpendicular to its plane and passes through its centre. It is subjected to a torque which produces a constant angular acceleration of $2.0{\text{rad s}}^{-2}$. Its net acceleration in ${\text{ms}}^{-2}$ at the end of $2.0\text{s}$ is approximately:

1. A
   $7.0$
2. B
   $6.0$
3. C
   $3.0$
4. D
   $8.0$