The assassination of Arch Duke France Ferdinand.
The correct answer is this one:
B. preside
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over the Senate
In practice however, the vice-president is not very present in the Senate and he can only vote to break a tie.
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Its easy, Akbar the Great and Sulaiman the Magnificent both were surprisingly tolerant to their subject religion wise and both were great rulers who led armies to victory. Akbar expanded the Mogul Empire, while Sulaiman beat Hungary at Mohacs in 1526.