According to the work of Lieberman and Laitman,…

According to the work of Lieberman and Laitman,…

According to the work of Lieberman and Laitman,...

According to the work of Lieberman and Laitman, language as we know it
appeared about ________ years ago and is associated with the development of
the vocal tract and other capabilities of

A) 6,000 / modern civilized humans
B) 2 million / Homo habilis
C) 3 million / Neanderthals
D) 100,000 / Homo sapiens 

Additional Requirements 
Level of Detail: Only answer needed