Question

what type of machine is a cd player?
o simple machine
o complex machine
o mechanical machine
o compound machine

Explanation:

A CD player is made up of multiple simple machines (like gears, screws etc.) working together. A simple machine has few parts and does one task. A complex machine (also called compound machine) is a combination of simple machines. A mechanical machine is a broad term but not the specific classification here. Since a CD player is a combination of simple machines, it is a compound (complex) machine.

Answer:

complex machine, compound machine