For the complete combustion of $1 \, mol$ of a compound with the molecular formula $C_xH_yO_z$,the number of moles of $O_2$ required is:
- A$x + y/4 - z/2$
- B$x + y/2 - z/4$
- C$x + y/4 + z/2$
- D$x + y/2 + z/4$
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