Which of the following did justinian i reconquer? prefecture of africa prefecture of the east kingdom of the franks kingdom of the sueves

The prefecture of Africa

Justinian worked to reconquer territories in North Africa that had been part of the Roman Empire, attacking the Vandals who had taken over North African territory.  The military expedition began in 533 AD.  The prefecture of North Africa was established in 534, though it would take several years before managing to control insurgency and maintain peace in the region.