Which of the following caused the Neolithic Agricultural Revolution?

Question

Advancing glaciers provided a stable water supply.
People learned how to domesticate plants and animals.
Retreating glaciers revealed fertile farm land.
People learned how to make metal farm tools.

I think it's C, can somebody help me out?! 🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻