$A$ gramophone record is revolving with an angular velocity $\omega$. $A$ coin is placed at a distance $r$ from the centre of the record. The static coefficient of friction is $\mu$. The coin will revolve with the record if

• A
  $r = \mu g \omega^2$
• B
  $r < \frac{\omega^2}{\mu g}$
• C
  $r \le \frac{\mu g}{\omega^2}$
• D
  $r \ge \frac{\mu g}{\omega^2}$