Which of these developments led human societies to develop farming and herding techniques during the Neolithic Revolution?

AHuman populations declined greatly after an era of intense cold.
BClimate conditions were no longer ideal for indigenous plants to grow on their own.
CLarge animal species on which hunter-gatherer societies depended became extinct.
DPeople needed goods to trade with the other groups they were starting to encounter.

The Neolithic revolution was a crucial change in the ways of life of mankind, in which we move from a nomadic to a sedentary lifestyle, which also leads to an economic transformation, from a collecting economy to an economy producer

Although it is known as "revolution", historians insist that it was a rather gradual change, the most accepted theory so far, in the 8th millennium BC, due to a climate crisis at the beginning of the Holocene. On the basis of its importance for the history of humanity, he claimed for himself the term "revolution".

It extends from the Paleolithic period, in which the stones were still carved, to the Neolithic, when the stones were polished, all with the purpose of making tools and weapons. It is part of what has been characterized as "Stone Age".

The first animal to enter the habitat of man was the dog. Ovine, bovine and caprine domestication are a fundamental pillar of production today. The domestication of the horse occurred at that time, in the area of Central Asia, along with that of the camelids, which occurred in different sectors.

Among the mammals that were selected for livestock, the pig occupied a main place. Poultry and raptors were used, particularly ducks and chickens. There is information about the use of insects, for example in beekeeping -bees- and sericulture -worms of silk-.