[单选题]
The power factor of an2pmd gcgfm*j,uy1 2ql(t l;m-d x m3o; RLC circuit is de cok /4w4x*kexy2) 6.c8*x agceoodxp fined 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. $\sin M = RZ/(X_L - X_C)$
