The correct answer is: A. Zero
At series resonance, the inductive reactance and capacitive reactance cancel each other out, leaving only the resistive component of the circuit current. This means that the net reactive component of circuit current is zero.
Inductive reactance is the opposition to the flow of alternating current (AC) in a circuit that contains an inductor. It is caused by the magnetic field that is created by the current flowing through the inductor. The inductive reactance is proportional to the frequency of the AC current and the inductance of the inductor.
Capacitive reactance is the opposition to the flow of AC current in a circuit that contains a capacitor. It is caused by the electric field that is created by the charge that is stored on the capacitor. The capacitive reactance is inversely proportional to the frequency of the AC current and the capacitance of the capacitor.
At series resonance, the inductive reactance and capacitive reactance are equal in magnitude but opposite in sign. This means that they cancel each other out, leaving only the resistive component of the circuit current. This is why the net reactive component of circuit current is zero at series resonance.