Why were the settlers' wagons referred to as prairie schooners?
A. They looked like ships on the sea.
B. They were made with parts from ships.
C. They were used only on the prairie.

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Robert J. The "prairie schooner" was the classic covered wagon that carried settlers westward across the North American plains. ... The nickname came from the typical white cloth cover on the wagon, which, from a distance, made it resemble the white cloth of a ship's sails.

The answer is A. they looked like ships on the sea