Hello!
This is a great question, and I'd say it focuses more on your reasoning rather than having the "right" law. A structure that I would follow would be:
- Briefly explain the law as it currently stands
- Identify the problem - what currently doesn't work and who this affects
- Explain the change you'd make
- Justify these changes - this could involve discussing the legal, commercial, or societal impact as a whole
I don't think it is necessary to link it to the firm (and I wouldn't try to force a link), but if you can naturally tie it to a practice area or sector the firm works in, that is a bonus! The key is to show your thought process, and that you have balanced the consequences to come to a clear conclusion.
I hope that helps!