Rate of Change of Polar Distance

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Given the polar function $r = f(\theta)$ where $f'(\theta) < 0$ for all $\theta$ , for which values of $\theta$ is the distance from the origin decreasing?

For every value of $\theta$

Whenever $f(\theta) > 0$

If $f(\theta) < 0$

Only when $f(\theta) = 0$

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