Following the end of the "Mandate System" the Middle East is C) fell into violence along political and religious lines.
The Mandate System was a system of governance in which certain territories that were previously part of the Ottoman Empire were administered by various European powers after World War I. The system was intended to prepare these territories for independence. \
So, The main causes of this violence were the deep-seated divisions between the different ethnic, religious, and nationalist groups in the region. These divisions had been exacerbated by the arbitrary boundaries drawn by the European powers, and they led to a series of conflicts that continue to plague the Middle East today.
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Following the end of the "Mandate System" the Middle East
A) returned to colonial rule after World War II.
B) withdrew from the newly-created United Nations.
C) fell into violence along political and religious lines.
D) saw an end to religious conflict among nations in the region