Answer:
Correct order is:
Paleolithic Era,
Neolithic Revolution,
River Valley Civilization.
Step-by-step explanation:
Paleolithic Era, or the Old Stone Age is usually dated from from about 2.5 million to 8000 B.C.
Neolithic Revolution happened during New Stone Age that is usually dated from about 8000 B.C. and ended as early as 3000 B.C. in some areas.
First civilizations that developed in the river valleys of Tigris, Euphrates, Nile, Indus, Ganges, Yellow River... appeared in the 4th Millennium BC.