[单选题]
The power factor of ygv, b5q) n6uhq2ar yd5hke6-)nc d 9c* xtx c95 iil3cy5x9raan RLC circuit is defined 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. $\sin M = RZ/(X_L - X_C)$
