If the differentiable function f (x) defined on (0, + ∞) satisfies: X · f '(x) < f (x) and f (1) = 0, then the solution set of F (x) x < 0 is () A. （0，1）B. （0，1）∪（1，+∞）C. （1，+∞）D. ϕ

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