The correct answer is: C. Small
At parallel resonance, the inductive reactance and capacitive reactance are equal in magnitude but opposite in sign, so they cancel each other out. This means that the impedance of the parallel circuit is equal to the resistance of the circuit, which is usually very small.
Option A is incorrect because the ratio of L to C is not very large at parallel resonance.
Option B is incorrect because the ratio of L to C is not zero at parallel resonance.
Option D is incorrect because the ratio of L to C is not none of the above at parallel resonance.