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 2 $\omega$ ₀, is inserted into the circuit.After transients die out the angular frequency of the current oscillations is:

A) " $\omega$ ₀/2"
B) " $\omega$ ₀"
C) "1.5 $\omega$ ₀"
D) "2 $\omega$ ₀"
E) "3 $\omega$ ₀"