Which of the following tools is a wheel and axle

Hello there!

Let's first consider. A wheel and axle would consists of when to parts, of ever more, would do a certain thing, and then change it. 

So, when looking at your options above, I would consider the option of "the man turning the door nob". The reason to why this would be the answer would be because in the door nob, they're two or more materials that would together do something, to either shut the door, and to close it also.

Your "the man opening/closing the door".

I hope this helps you!

I believe the very last one!
Happy to help.
~Brooke❤️