Electromagnetic Induction and Alternating Currents: JEE Main 2021 Physics question

A series LCR circuit driven by 300 V at a frequency of 50 Hz contains a resistance R = 3 k$\Omega$, an inductor of inductive reactance X_L = 250 $\pi$$\Omega$ and an unknown capacitor. The value of capacitance to maximize the average power should be : (Take $\pi$² = 10)