During the neolithic revolution people could stay in one place because food supply increased and new jobs emerged. conflicts over rights to territory declined. the supply of water began to increase. leadership roles were expanded beyond one person.

food supply increased and new jobs emerged

Explanation:

The Neolithic Revolution was a major turning point for the development of the humans. It was the period in which the humans started to practice agriculutre. This led to the humans to start having a settled life-style, as the main problem, the food supplies, were now solved, so there was no need for a nomadic life and constant search for food. Since the humans settled, and their main problem was solved, they also had much more spare time, so gradually they started to get involved in other things, such as metalwork, astronomy, philosophy, science, architecture, which created new jobs, rapid development, and a hige change in the society and the manner in which it functioned.

the answer wold be b) travel among nations should be regulated by an international organization