I'm not entirely sure, but I think it is B) the pulley.
There are more but birds would be a bad index fossils
I hope this helps!
Cotton mainly come from plantations or huge fields grow on smaller tree like plants. They are hand picked when ready. This cotton is then usually sent to a factory and turned into fabric which then turned into shirts, or sent to manufacturing companies.
~I hope this helped!
I am, yours most sincerely,
Joshua A. Bunn