If g(x)=x^2+x-2 and 1/2gof(x)=2x^2-5x+2,...

If `g(x)=x^2+x-2` and `1/2gof(x)=2x^2-5x+2,` then which is not a possible `f(x)?` (A)`2x-3` (B) `-2x+2` (C)`x-3` (D) None of these

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