Answer the following question given this paragraph: 

A wheel and axle is a simple machine that consists of two connected rings or cylinders, one inside the other, which both turn in the same direction around a single center point. When force is applied to the inner axle, the ideal mechanical advantage is less than 1. When force is applied to the outer wheel, the ideal mechanical advantage is greater than 1.


Q: What simple machine consists of two connected rings or cylinders, one inside the other, which both turn in the same direction around a single center point?

 Choices:

- pully

- bloom and axle

- spoke

- wheel and axle

A:
wheel and axle
