Q32. A lightly damped harmonic oscillator with natural frequency $\omega_0$ is driven by a periodic force of frequency $\omega$. The amplitude of oscillation is maximum when (a) $\omega$ is slightly lower than $\omega_0$ (b) $\omega = \omega_0$ (c) $\omega$ is slightly higher than $\omega_0$ (d) The force is in phase with the displacement
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