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Answer:
![\text{(c)} \quad 9m^6-12m^4-6m^3-3m^2](https://img.qammunity.org/2022/formulas/mathematics/high-school/o6kmx642xcza3hi7fm5tk2zxmkgkyi5fnh.png)
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.
![9m^6-12m^4-6m^3-3m^2](https://img.qammunity.org/2022/formulas/mathematics/high-school/19uzo4rd3vsobuoj7793e2376ak8qdzlbj.png)