Which revolution ushered in the Neolithic Revolution?

The most likely answer for this question is the First Agricultural Revolution.  However, you should note that this is almost synonymous with the Neolithic Revolution so this may not be the right answer.  I would suggest that you check in your class notes and/or textbook to see what answer your instructor expects.

The Neolithic Revolution can be defined as the time when people stopped being nomadic and settled down into sedentary settlements. This was perhaps the most important change in all of human history as it led to civilization.  When people became sedentary, they gained the ability to create technology.  Nomadic people really could not create much technology because they could only use things that they could carry with them as they moved.  A spinning wheel and loom, for example, would not help a nomadic society because they could not carry such things with them as they traveled from place to place.  When people settled down and lived in one place, they could develop new technologies that were not portable. They could also create larger, more complex societies that we now call civilizations.

All of this only became possible because of agriculture.  Without agriculture, sedentary living is almost impossible (unless people live in a very productive environment).  When people start to cultivate plants, they can produce enough food to support a larger, denser population.  They can also produce that food in one place so they do not need to move around. This shows that agriculture is necessary in order to have civilization.  Without agriculture there can be no settlements where people can live permanently and where they can create complex societies with advanced technology. Therefore, the Agricultural Revolution, in which agriculture began, was necessary to usher in the Neolithic Revolution.