Early civilizations changed how they watered crops by: A. using slash-and-burn agriculture to help forests grow.

B. digging canals to control the flow of rivers.

C. draining all the water out of large rivers.

D. using terrace farming to make the soil more fertile.

B

Explanation:

digging canals, irrigation changed the world of agriculture forever

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.