[单选题]
Consider an RLC series circoz 5/;ns+o fuoh0c .cruitolr c;71as+jskde i wct1g /9dp5r u43. 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