The least number among \frac{4}{9}, \sqrt{\frac{9}{49}}, 0.\overline{45} and \left ( 0.8 \right )^{2} is :
[A] 0.\overline{45}
[B] \left ( 0.8 \right )^{2}
[C] \frac{4}{9}
[D] \sqrt{\frac{9}{49}}
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