An inductance of `0.4/(pi)` henry and a resistace of `30 Omega` are joined in series. If an alternating e.m.f. of 200 V, 50 Hz is applied to their combination, then the impedance of the circuit will be
A. `50 Omega`
B. `40 Omega`
C. `100 Omega`
D. `10 Omega`