If I'm not sure what the relevant source of law is (or even what that means), should I guess based on the location? [1]
No. If you don't know the source of law, please leave the field blank.
Links
[1] https://www.dmlp.org/faq/if-im-not-sure-what-relevant-source-law-or-even-what-means-should-i-guess-based-location