1 . x2-1-yy+2

• A. $\left(x-y-1\right)\left(x-y+1\right)$
• B. $\left(x-y+1\right)\left(x+y+1\right)$
• C. $\left(x+y+1\right)\left(x-y-1\right)$
• D. $\left(x-y\right)\left(x+y+1\right)$

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Answer: Option C

Explanation: