Ah, an opinion piece
@WeGotThis! Although this does not need to be linked back to the firm, I think it's wise to identify a law that's relevant to the firm, its practices or at the very least its clients. Regardless, this question is more about seeing what makes you tick, and your assessment will be based on your commercial understanding of the challenges with certain laws, your ability to analyse the situation, and back up your answer with a detailed explanation. I would therefore suggest the following structure:
1. Introduce a certain challenge behind a current law catered to a specific demographic, whether that be the wider public, businesses, or if you want brownie points, then a particular industry (preferably one the law firm tend to deal with). Explain what this is, and more importantly what the impact of those challenges are.
2. Suggest your change to this law - be mindful that you don't come across unrealistic and those changes are tangible
3. Explain why you think that change would be beneficial to the demographic it is currently presenting challenges for, it would be great if you could go into detail as to how this change mitigates against those specific challenges you previously identified
4. Think about what other changes may be required to solidify this change in law, sometimes its not just the law change itself, its about education, regulation, observance etc - don't be afraid to highlight some minimal weaknesses in your proposed change, that you can show you've already considered and have presented mitigations for.