One major factor in the Byzantine Empire's decline was that it:

Your answer is A

Explanation:

The byzantine empire was decline by the fact that they didn't want to trade with Muslim empires.

Internal fighting during the Civil Wars were probably the most inportant single causes of the Byzantine collapse.

Explanation:

the main reason that the constitution did not proclaim all men to be free and equal is because of the issue of slavery.

it should be a. song dynasty’s civil service examination system created an administrative bureaucracy manned by the landed aristocracy.