The coercivity of a small magnet where the ferromagnet gets demagnetized is $3 \times10^3\;Am^{-1}$. The current required to a passed in a solenoid of length $10\; cm$ and number of turns $100$, so that the magnet gets demagnetized when inside the solenoid, is

Question

$\begin{array}{1 1}(A)\;3\;A \\ (B)\;6\;A \\(C)\;30\;mA \\(D)\;60\;mA \end{array} $