Please help for a brainlist :)) Which of the following was a weakness of the Articles of Confederation?

a)

Only Congress had the power to tax.

b)

There was no legislative branch of government.

c)

State governments had no authority.

d)

There was no national court system.

Historians have recently discovered a historical journal published in the early twentieth century. the journal contains facts based on original sources about the downfall of the early byzantium empire. historians consider this long-lost journal to be a breakthrough in their understanding of the byzantium empire. based on this information, the journal is a source.