Let \( h(x)=x^{m / n} \) for \( x \in R \), where \( m \) and \( n \) are odd numbers and \( 0mn...

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Let \( h(x)=x^{m / n} \) for \( x \in R \), where \( m \) and \( n \) are odd numbers and \( 0mn \). Then \( y=h(x) \) has
(A) no local extremums
(B) one local maximum
(C) one local minimum
(D) none of these
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