Question

a machine is a device that can make work easier.
there are 6 simple machines:
a lever is a bar that pivots around a fulcrum (the pivot point).
an inclined plane is a flat surface that slopes.
a wheel and axle is a wheel attached to a smaller axle. these two parts rotate together to create a simple machine.
a wedge is two inclined planes back to back.
a pulley is a grooved wheel with a cable wrapped around it.
a screw is an inclined plane wrapped around a post.
a compound machine is a device made up of two or more simple machines.
what is an example of a simple machine?
a lever
a boat
a building

Explanation:

The question asks for an example of a simple machine. As per the given information, a lever is one of the 6 simple machines. A boat and a building are not simple machines. A boat is a compound machine (made of multiple simple machines like levers, pulleys etc.) and a building is a structure, not a machine.

Answer:

A. A lever