Cuz the other ones are fat
The answers on the list are #2, #3 and #4. Those are the answers.
More white land owning men lived there, and they were more likely to vote.
The main reason why we know more about Hammurabi's Code than other early forms of law is because Hammurabi's Code was the first (or at least one of the first) codes of law to be permanently inscribed on stone instead of issued on paper or through word of mouth.