The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

• A. <img src="/_files/images/mechanical-engineering/engineering-mechanics/36-155-1.png">
• B. <img src="/_files/images/mechanical-engineering/engineering-mechanics/36-155-2.png">
• C. <img src="/_files/images/mechanical-engineering/engineering-mechanics/36-155-3.png">
• D. <img src="/_files/images/mechanical-engineering/engineering-mechanics/36-155-4.png">