[单选题]
Consider an RLC serirtnm roq oz;+f(0h98h/q/-lowq8hl frx yl6-g*cd /(3cbo fy+tjjp6 es circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?
A. always true
B. true only if $X_L$ is less than or equal to $X_C$
C. true only if $X_L$ is greater than or equal to $X_C$
D. never true