y=f(x) is a continuous function such tha...

`y=f(x)` is a continuous function such that its graph passes through `(a ,0)` . Then `("lim")_(x->a)(log_e(1+3f(x)))/(2f(x))i s :` (a) `1` (b) `0` (c) `3/2` (d) `2/3`

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