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Neuron
The majority of linguists believe that a mother language which all of us share at some basic root was developed and originated from D - Eurasia. We often also call languages to be Indo-European, referring to the nature of which these languages were developed in terms of their location. 

Answer:

Its Eurasia

Explanation:

There are two main branches of human language: Indo-European and Afro-Asiatic, each containing various language families. One theory states that the members of each of these linguistic groups descended from one "proto-language," a common ancestor. Experts believe these proto-languages may have been spoken as recently as a few thousand years ago. The majority of linguists believe the first "mother" language originated somewhere in Eurasia, although this is not known for certain.