The correct answer is "B)".
The Paleolithic era is known for the original development of stone tools. Around 50000 BP, the use of these artifacts continued to develop and there is evidence of a wider variety of tools in Africa. These tools were classified in categories such as projectile points, knives, drilling tools, and engraving tools.
At some point between 50000 BP and 40000 BP, the first humans set foot in Australia.