Which of the following leaders attempted but failed to regain the provinces of the western roman empire under the byzantine empire due to financial problems?

romulus augustulus
constantine
justinian i
basil i

i think this is constantine or justinian i, am i right?

Justinian I attempted but failed to regain the provinces of the Western Roman Empire under the Byzantine Empire due to financial problems.  Option C is correct.

Justinian I ofically known as Justinian the Great and also Saint Justinian the Great in the Eastern Orthodox Church, was the Eastern Roman emperor from 527 to 565. He tried to revive the empire's greatness and regain the lost western half of the historical Roman Empire.

gaius cassius longinus and marcus junius brutus, former enemies of julius caesar who'd joined the roman senate, led caesar's assassination, dubbing themselves "the liberators." and the second one is   the assassination of julius caesar was the result of a conspiracy by many roman senators led by gaius cassius longinus, decimus junius brutus albinus, and marcus junius brutus. they stabbed caesar (23 times) to death in a location adjacent to the theatre of pompey on the ides of march 15 march 44 bc.