Why did justinian i fail to regain all of the former provinces of the old roman empire? a. his general made military blunders b. his troops mutinied c. he ran out of money d. he didn't equip his troops well.

"He ran out of money" is the reason among the choices given in the question that Justinian I failed to regain all of the former provinces of the old Roman Empire. The correct option among all the options that are given in the question is the third option or option "c". I hope the answer has helped you.

The answer would be west.