What could the author add to this article to help you better understand where hunter-gatherers have been in the world over time.

A. A table of info on what hunter-gatherers eat.
B. A picture of hunter-gatherers hunting for food.
C. An interview with a scientist.
D. A map with dates on it.

D. A map with dates on it.

This would visually show the movement and locations of hunter-gatherer societies over time, helping readers understand their patterns of migration and settlement.