Answer the following question given this paragraph: 

Look at the wheelbarrow in the Figure below . It is used to carry heavy objects. It consists of two simple machines: a lever and a wheel and axle. Effort is applied to the lever by picking up the handles of the wheelbarrow. The lever, in turn, applies upward force to the load. The force is increased by the lever, making the load easier to lift. Effort is applied to the wheel of the wheelbarrow by pushing it over the ground. The rolling wheel turns the axle and increases the force, making it easier to push the load.


Q: What simple machine works with a wheel and axle in a wheelbarrow?

 Choices:

- pulley

- hammer

- blade

- lever

A:
lever
