The Angular Frequency of a Certain RLC Series Circuit Is $\omega$

The angular frequency of a certain RLC series circuit is $\omega$ ₀.A source of sinusoidal emf, with angular frequency $\omega$ , is inserted into the circuit and $\omega$ is varied while the amplitude of the source is held constant.For which of the following values of $\omega$ is the amplitude of the current oscillations the greatest?

A) " $\omega$ ₀/5"
B) " $\omega$ ₀/2"
C) " $\omega$ ₀"
D) "2 $\omega$ ₀"
E) "None of them (they all produce the same current amplitude) "