Answer :

[tex]LCD\left(\frac{9}{14};\ \frac{2}{21}\right)\\\\14=2\times\boxed7;\ 21=3\times\boxed7\\\\therefore\\\\LCD\left(\frac{9}{14};\ \frac{2}{21}\right)=\boxed7\times2\times3=\boxed{\boxed{42\leftarrow B}}[/tex]

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