Among geographers and linguists a prevalent, though controversial, theory posits that the rise of transformed the distribution of the world’s languages and language families.

Among geographers and linguists a prevalent, though controversial, theory posits that the rise of Agriculture and the subsequent spread of Farming populations transformed the distribution of the world’s languages and language families.

Explanation:

Geographers consider that the development of agriculture and settlements allowed languages to be widened and spread over different regions. Making them evolve from different tongues to one common language in small zones to develop a single language in several geographic zones to make them be used by different civilizations. An example of this is how different Spanish regions had their tongue. But after the conquest and influence of their conquerors' languages, they all unified to speak Spanish. as well as French and Italian in different regions of the same continent.

c. indicates the aid for which you qualify, and allows you to choose what and how much to accept