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What determines the speed of a pulley system?

A The size and ratio of all pulleys involved
Explaination
The size and ratio of all involved pulleys determines the speed of a pulley. A large pulley driving a smaller pulley, for instance, will result in greater speed, as the large pulley's single revolution will result in multiple revolutions for smaller pulleys. The length and material of the belts are not a factor, nor is the size of the pulleys as a whole, rather than in relation to one another.
B The size of the pulleys as a whole
C The length of the rope or belt used in the pulley system
D The material used as the belt (such as leather and rubber)