Slash-and-burn agriculture is best defined as the process of

cutting plants and setting fires to fertilize farmland for crops.

cutting steps into a hillside to make a flat surface for crops.

using ash from fires to make farmland fertile for decades.

clearing forests to make farmland fertile for generations

I believe the answer is A

Assemblies do not have written codes of laws. laws are matters for magistrates and courts, not assemblies. codes of law are things such as civil law, criminal law, and constitutional law. what assemblies have are procedures regarding debating, voting and other business they might carry out.  also note that rome had three assemblies: the assembly of the soldiers, the assembly of the tribes, and the plebeian councils.