D because without farming they wouldn't be able to stay in an area for an extended amount of time. Hunting would have the people moving place to place to find more game to hunt
During the Agriculture Revolution or Neolithic Revolution, humans learned agriculture techniques that allow them to settle in one place. They also started to domesticate animals. For instance, the Sumerians settled between the Euphrates and Tigres Rivers, in the Middle East Region. The flood of the rivers made the land so fertile and humans started to grow crops. This helped in the establishment of the first villages.
You can play games involving the curriculums/class your learning, make flashcards, quiz's with friends, and looking into how to do something or just look into the thing your learning