Prehistory is the time before? someone help me plz

Plz don’t mind I didn’t mean to push a

Prehistory , the vast period of time before written records or human documentation, includes the Neolithic Revolution, Neanderthals and Denisovans, Stonehenge, the Ice Age and more.

Its B i am pretty sure

the correct labels are as follows:

a: yellow river

b: himalayan mountains

c: north china plain

d: taklimakan desert

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place