Respuesta :

A mother tongue, as in the first language ever spoken by humans? This would likely be in Africa, as humans are likely to have developed language before migrating to other contintents: as shown by the fact that languages are spoken on ALL continents. 

if it developed in Eurasia, we would have to explain how people in Africa, who never left, developed language... 

The correct answer is number 4. Africa.

It is believed that a mother language originally developed in Africa.

Scientists consider Africa as the cradle of humankind. Scientists also have traced almost six thousand languages from around the world and considered that the original mother language of humanity could be traced back to Africa, 65 thousand years ago. The first Diaspora or emigration from Africa took the first language with them to other territories.