It would be C. This is because each branch is checking each other's powers and in effect balancing them out.
One other there greatest accomplishments are
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A Umayyad woman would most likely be able to open her own business. The correct option among all the options that are given in the question is the first option or option "A".
Most people within the Byzantine and Persian empires accept Islam so easily because trade opportunities would increase and improve their earnings. The correct option is option "D".