1. The problem seems to be about understanding the expression $x - z$ given the inequality $x > y$. 2. The expressions in options a, b, c, and d involve $y$, $z$, and variations with $zy$ or $zo$. 3. Given only $x > y$, there is no direct simplification or equivalence relating $x - z$ to $y - zy$, $y - zo$, or $y - z$ without additional context or operations. 4. Therefore, none of the given options (a, b, c, d) can be identified as equivalent to $x - z$ based solely on the inequality $x > y$. 5. The problem might be incomplete or requires more information to determine the correct expression related to $x - z$ when $x > y$. Final note: The expression $x - z$ remains as is since $x > y$ does not provide grounds to rewrite it in terms of $y$ and $z$.