5. Place the following events in chronological order: River Valley Civilization, Paleolithic Era, Neolithic Revolution.

Correct order is:

Paleolithic Era,

Neolithic  Revolution,

River Valley Civilization.

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.

i think the answer would happen to be the letter b

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