Option A: Incorrect. Tuning for minimum loading isn't the solution - parasitic suppressors and neutralization prevent oscillations. Minimum loading isn't the solution. Option B: Incorrect. Tuning both input and output for maximum power isn't the solution - parasitic suppressors and neutralization prevent oscillations. Maximum power isn't the solution. Option D: Incorrect. Using phase inverter in output filter isn't the solution - parasitic suppressors and neutralization prevent oscillations. Phase inverter isn't the solution.