The native peoples who lived in the Columbian Plateau region relied heavily on rain and cultivating corn

fished in the waters of the Atlantic Ocean

relied heavily on water and fish of the Columbia River

fished in the waters of the Pacific Ocean

Explanation: Four of these tribes are the Yakama Umatilla, Warm Springs, and Nez Perce. These tribes are known as "Plateau Tribes" because their home is called the Columbia Plateau. The Plateau Indians are still here today. Many live in special areas called reservations that were set aside for them in the 1800s.

C. relied heavily on water and fish of the Columbia River.

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explanation:

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