Answer
All three graphs have the same angular frequency.
Work Step by Step
Angular frequency is defined as $\omega=2\pi f$, where $f=\frac{1}{T}$, so $\omega=\frac{2\pi}{T}$, where $T$ is the period. Therefore, as the period increases, angular frequency decreases. They all seem to have the same period, so they all seem to have the same angular frequency.