Answer:
BLACK LIVES MATTER AND VOTE FOR JOE BIDEN
It should be the 3rd one but idk for sure. if its not then its the 3rd one

Step-by-step explanation:
This can be written as;

Perform factorization
9-a²=difference of squares formula
(3+a)(3-a)
4a²-4a-24
4(a²-a-6)
4(a²-3a+2a-6)
4(a(a-3)+2(a-3))
4((a+2)(a-3))
a²-6a+9
a²-3a-3a+9
a(a-3)-3(a-3)
(a-3)(a-3)
Rewrite the operation as;

cancel common to remain with;

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Factorization : brainly.com/question/11930808
Keywords : Operation
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It’s A because it’s not that hard