Which is not a simple machine?

Question 1 options:

pulley

ramp

bicycle

wood screw

What are not simple machines?

Simple machine, any of several devices with few or no moving parts that are used to modify motion and force in order to perform work. The simple machines are the inclined plane, lever, wedge, wheel and axle, pulley, and screw.

Bicycle

Explanation:

It turns out that there are at three simple machines found in a bicycle: lever, pulley, and wheel-and-axle. Anything made from multiple simple machines is a compound machine.