The correct answer is: A. Equal to but opposite in phase to.
At series resonance, the inductive reactance and capacitive reactance cancel each other out, leaving only the resistance in the circuit. This means that the current through the circuit is at its maximum, and the voltage across the inductor and capacitor are equal in magnitude but opposite in phase.
Option B is incorrect because the voltage across the inductor and capacitor are opposite in phase, not in phase.
Option C is incorrect because the voltage across the inductor and capacitor are equal in magnitude, not greater than.
Option D is incorrect because the voltage across the inductor and capacitor are opposite in phase, not in phase.