Columbia River. The river is 1243 mi long, and its largest tributary is the Snake River. Its drainage basin is roughly the size of France and extends into seven US states and a Canadian province. Overland explorers entered the Willamette Valley through the scenic but treacherous Columbia River Gorge, and pioneers began to settle the valley in increasing numbers. Since the early 20th century, dams have been built across the river for power generation, navigation, irrigation, and flood control.
The Columbia River undergoes drainage.
Columbia River. The river is 1243 mi long, and its largest tributary is the Snake River. Its drainage basin is roughly the size of France and extends into seven US states and a Canadian province. Overland explorers entered the Willamette Valley through the scenic but treacherous Columbia River Gorge, and pioneers began to settle the valley in increasing numbers. Since the early 20th century, dams have been built across the river for power generation, navigation, irrigation, and flood control.

Based on the evidence paragraph above what can we conclude about the claim "The Columbia River undergoes drainage."?

Options: 

 - supported

 - refuted

 - not enough information
supported
Columbia River. The river is 1243 mi long, and its largest tributary is the Snake River. Its drainage basin is roughly the size of France and extends into seven US states and a Canadian province. Overland explorers entered the Willamette Valley through the scenic but treacherous Columbia River Gorge, and pioneers began to settle the valley in increasing numbers. Since the early 20th century, dams have been built across the river for power generation, navigation, irrigation, and flood control.

Based on the evidence paragraph above what can we conclude about the claim "The Columbia River undergoes drainage."?

Options: 

 - supported

 - refuted

 - not enough information
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supported
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