A Circuit Consists of a 10-MH Coil, a 12- $\Omega$ Resistor, a 60-

A circuit consists of a 10-mH coil, a 12- $\Omega$ resistor, a 60- $\Omega$ resistor, a 9.0-V battery, and a switch, all in series. What is the time constant of this circuit?

A) 2.5 * 10^-3 s
B) 5.6 *10^-4 s
C) 1.4 * 10^-4 s
D) 9.0 * 10^-2 s