Which led to the division between sunnis and shias following the death of muhammad
a. warfare between persians and turks
b. conflict over who should be the caliph
c. warfare between the umayyad and abbasid dynasties
d. dispute over the meaning of jihad

conflict over who should be the caliph I guess ^^;

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.