Armenians were mostly Christian, and were suspected of allying with fellow Christians. The correct option is B.
The differences in religion played a crucial role in the foundation of abuse that the Turks perpetrated upon the Armenians. The dominant religion of Armenia was Christianity, and the Muslim Turks could assert the primacy of their own religion on the subjugated Armenians.
The Armenian Genocide also refered to as the Armenian Holocaust, was the systematic extermination of 1.5 million Armenians perpetrated by the Ottoman government, mostly citizens within the Ottoman Empire.