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[tex] \frac{14}{12} = \frac{AB}{18} \\ [/tex]
[tex] \frac{7}{6} = \frac{AB}{18} \\ [/tex]
Multiply sides by 18
[tex]18 \times \frac{7}{6} =18 \times \frac{AB}{18} \\ [/tex]
[tex]3 \times 7 = AB[/tex]
[tex]AB = 21[/tex]
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Thus the correct answer is (( C )) .
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