Concept:A simple machine is a device that makes work easier by changing the size or direction of an applied force.
Explanation:Work is done when a force moves an object through a distance.
A simple machine helps us perform the same work with less effort or in a more convenient way.
For example, a lever or pulley allows a small effort to lift a heavy load.
It does not reduce the total work needed, but it makes the task easier to perform.
Therefore, the statement that correctly defines a simple machine is: a device with which work can be done easily.
The other options describe a generator, a vehicle, or Newton's first law of motion, not a simple machine.
Answer:Option C.