Hello! Your answer is The Law of the Twelve Tables code was displayed at the Roman Forum.
The Law of the Twelve Tables formed the foundation of all Roman law. It stated the rights and the duties of the Roman citizen. This was displayed at the forum, which is a public square.
The other three choices are all from different empires. Assura - Assyrians, Hammurabi - Babylonia (I believe), and Ashoka's edicts - Ashoka's views on Buddhism.
Hope this helps!