The Root Cause of the Crimean War Was the Ottoman

The root cause of the Crimean War was the Ottoman Empire's goal, supported by the British and the French, to thwart

A) Russia's desire to expand south through the Black Sea region.
B) Russia's desire to spread Orthodox Christianity throughout the Ottoman Empire.
C) Ottoman domination of Serbia.
D) Russia's desire to control Constantinople (Istanbul) .
E) Russia's siding with Greece during the 1829 independence movement.