Let \( f: R \rightarrow R \) be a positive increasing function with \( \lim _{x \rightarrow \inf...

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Let \( f: R \rightarrow R \) be a positive increasing function with \( \lim _{x \rightarrow \infty} \frac{f(3 x)}{f(x)}=1 \). Then \( \lim _{x \rightarrow \infty} \frac{f(2 x)}{f(x)} \)
(a) \( \frac{2}{3} \)
(b) \( \frac{3}{2} \)
(c) 3
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