\( \int \frac{\left\{f(x) \cdot \phi^{\prime}(x)-f^{\prime}(x) \cdot \phi(x)\right\}}{f(x) \cdot...
\( \int \frac{\left\{f(x) \cdot \phi^{\prime}(x)-f^{\prime}(x) \cdot \phi(x)\right\}}{f(x) \cdot \phi(x)}\{\log \phi(x)-\log f(x)\} d x \) is equal to
(A) \( \log \frac{\phi(x)}{f(x)}+k \)
(B) \( \frac{1}{2}\left\{\log \frac{\phi(x)}{f(x)}\right\}^{2}+k \)
(C) \( \frac{\phi(x)}{f(x)} \log \frac{\phi(x)}{f(x)}+k \)
(D) None of these
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