The void was filled by the Dark Ages. After the fall of the Western Roman Empire, there were barbarians that were threateing all around Europe and who did not wish for the progression of society and humanity. They only cared about pillaging and looting - hence the name dark ages.
It was Homo erectus.
This species is extinct. It is believed to be the first fossil about 1.9 million years ago. Many believe it looks like an ape. Homo erectus is the ancestor of morden human beings.
George Washington was the First President
The correct answer is B. Hope I helped :)