Justinian and Theodora helped the Byzantine Empire rise in power by: A. reuniting the Catholic and Orthodox churches.
B. starting a rebellion against Emperor Diocletian.
C. capturing territory in western Europe.
D. calling for a crusade against Muslim empires.

Correct answer is C. capturing territory in western Europe.

Explanation:

Option A is not correct as the church were divided in 1054 and never again were reunited.

B is not correct as Diocletian ruled between 3rd and 4th Century and Justinian ruled with Theodora in 6th Century.

C is correct as they managed to destroy Kingdom of Vandals in Northern Africa and Kingdom of Ostrogoths in Italy.

D is not correct as this was done in 11th Century by Emperor Alexius Comnenus.

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