1 . a2-3a,a2-9,a2-4a+3

• A. $a\left(a-3\right)$
• B. $a-3$
• C. $\left(a-1\right)\left(a-3\right)$
• D. $a\left(a-1\right)\left(a-3\right)$

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Answer: Option B

Explanation: