What brought an end to the "normal state of hostility" between the Safavids and Ottomans mentioned in the passage? A. Safavid fervor for its brand of Islam slowly declined until the two empires stopped fighting.
B. The constant fighting increased the respect of the empires for each other, which eventually led to peace between them.
C. Both sides united to fight against European Christian forces that threatened them.
D. The Ottomans slowly weakened until the Safavids no longer saw them as a threat.