1. $x^3+6x^{2}y+11x{y}^2+6y^3$

• A. $\left(x+y\right)\left(x+2y\right)\left(x+3y\right)$
• B. $\left(x+y\right)\left(x+2y\right)\left(x+3y\right)$
• C. $\left(x+y\right)\left(x+2y\right)\left(x+3y\right)$
• D. $\left(x+y\right)\left(x+2y\right)\left(x+3y\right)$

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