Why did justinian i want to reform the law of the byzantine empire?
a. the code needed to be collected and reorganized.
b. the code needed revisions to remove laws regarding slavery.
c. the code included ordinances, but they needed to be removed.
d. the code did not include imperial decrees, which had to be added.

I believe the answer is: a.The code needed to be collected and reorganized. 

At that time, Justinian see the law imposed in the Roman empire to be non-transparent, which make the government officials to have to much power because they can make punishment even without clear legal grounds. The reorganizing that made by Justinian makes all regulations become transparent to all people.

Justinian I wanted to reform the law of the Byzantine Empire because the code needed to be collected and reorganized. They had inherited numerous laws from Rome and needed to clear these. The correct answer is A.