The correct answer is A) Sultan realized they had expanded the Empire beyond ruling ability.
The 1622 Janissary Revolt against the Ottoman leadership was one of the situations that marked the beginning of the decline of the empire because Suktan realized they had expanded the Empire beyond ruling ability.
Another important cause was the Household troops of the Sultan in the Ottoman Empire that were called the Janissary. They were like the infantry, an elite group that secured the palace and the Sultan. Their preparation and position in the empire made them rebel a couple of times in those years. The Rebellion of 1622 started because they knew the power they had and the influence that they could exert in the reign. They wanted many concessions and became more of a rebellious group rather than a military force that could be used in war.
This and the fact that the empire had expanded beyond ruling ability, marked the beginning of the end of the Empire.