$A$ function $f: R - \{ 0 \} \rightarrow R$ is defined as $f(x) = \begin{cases} x^2 + 3x - 7, & x > 0 \\ h(x), & x < 0 \end{cases}$ If $f(x)$ is an odd function,then $h(x) =$
- A$x^2 + 3x + 7$
- B$x^2 + 3x - 7$
- C$-x^2 + 3x + 7$
- D$-x^2 - 3x + 7$
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