[单选题]
The power factor of an RLC circuit isopa* d8zw/5kz defw u;mo.y8i- m85wmee xmn(h k(ined as $\cos M = R/Z$, but the phase angle can also be calculated from .
A. $\sin M = (X_L - X_C)/Z$
B. $\sin M = (X_L - X_C)/RZ$
C. $\sin M = Z/(X_L - X_C)$
D. $\sin M = RZ/(X_L - X_C)$
