Final answer:
The book of Justinian law that was about settling disputes between people was the Digest (b).
Step-by-step explanation:
The Code of Justinian was a legal project carried out by Emperor Justinian to compile and edit Roman edicts issued from the second to the sixth century CE. It was a comprehensive code of laws that covered various legal aspects..
On the other hand, the Digest, also known as the Pandects, was a collection of juridical opinions and legal writings by prominent Roman jurists. It served as a compilation of legal precedents and principles to guide judges and arbiters in settling legal disputes between individuals.
The answer is option ⇒b.