Hello there! The answer is A: Paleolithic Era.
Paleolithic Era: Occurred 2.6 million years ago.
Neolithic Era: Occurred from 9,000 B.C. to about 3,000 B.C.
Bronze Age: Occurred around 4,000 years ago.
Iron Age: Occurred from from 750 BC to AD 43.
This means that the Paleolithic Era occurred first. I hope this helps and have a great day!
