Answer the following question given this paragraph: 

A person is able to lift the entire rear end of the automobile using only one hand with the hydraulic jack shown in the image. Hydraulic systems are similar to simple machines in that they can produce very large mechanical advantages.


Q: A hydraulic jack that makes it possible to lift a car easily is an example of what, meaning it produces mechanical advantages?

 Choices:

- quantum physics

- simple weapon

- complex machines

- simple machine

A:
simple machine
