At one instant in time the current in the circuit below is $20\mathrm{.}0$ mA$.$ What is the rate at which the current is changing at that instant? $150100$ I $400$ mH $($A$)25\mathrm{.}0$ A$/$s $($B$)12\mathrm{.}5$ A$/$s $($C$)0\mathrm{.}0$ A$/$s $($D$)-12\mathrm{.}5$ A$/$s $($E$)-25\mathrm{.}0$ A$/$s