Answer:
C. 6
Step-by-step explanation:
[tex]\frac{ZY}{FE} =\frac{XY}{DE}[/tex]
[tex]\frac{12}{8} =\frac{9}{DE}[/tex]
[tex]12DE=(9)(8)[/tex]
[tex]DE=\frac{(9)(8)}{12} =\frac{72}{12} =6[/tex]
Hope this helps