Most of the cases the supreme court chooses to review come from the
a. us congress
b. international tribunals
c. lower courts
d. state supreme courts

Most of the cases the Supreme Court chooses to review come from the "d. state supreme courts" since these are the cases that are often the most controversial. 

The articles created a national government composed of a congress, which had the power to declare war, sign treaties, make alliances and more.

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.