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Answer:
[tex]\text{(c)} \quad 9m^6-12m^4-6m^3-3m^2[/tex]
Step-by-step explanation:
As is often the case with multiple choice questions, you only need to identify a feature of the answer set that distinguishes right from wrong. Here, that can be the lowest-power term, which is always the product of the lowest-power terms.
That product is (-3m)(+m) = -3m². This matches the third answer choice.
[tex]9m^6-12m^4-6m^3-3m^2[/tex]
