Answer :
[tex]\frac{n}{9}=\frac{56}{63} \\\\ n=\frac{9*56}{63} \\\\ n=\frac{56}{7} \\\\ \boxed{n=8}\to the \ variant \ C[/tex]
[tex]\frac{n}{9}=\frac{56}{63}\\
\frac{n}{9}=\frac{8}{9}\\
n=8
[/tex]