used to perform a task. made from natural materials. made up of more than one simple machine. complicated to build and repair.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A bicycle is considered a complex machine because it is
Possibilities:
- used to perform a task.
- made from natural materials.
- made up of more than one simple machine.
- complicated to build and repair.

made up of more than one simple machine.