Need help asap!! When historians refer to "Prehistory", what are they talking about?

The era before humans populated the Earth

The era before the written word was invented

The era before agriculture was invented

The era before the traditional family unit was established

events that occurred before the existence of written records in a given culture or society.

This means the second one or the one that says The era before the written word was invented

each played a major role in ending the cold war.

the western roman empire flourished, but the eastern portion of the empire struggled.