When RLC is in a resonance state that means the total impedance seen by Vs is just Rs. I see no use in this information.
This problem kinda confuses me because there's no current flowing into the gate of this transistor so there would be no voltage drop in Rs so the amplitude at the gate would be the same of signal Vs.
Perhaps if the frequency wasnt the same as the resonance state there would be some flow because of the parasitic capacitance connecting to the source?
Edit, second attempt: