Answer:
The correct answer is A.
Step-by-step explanation:
The Three Forks refers to the area around the confluence of the Arkansas, Verdigris and Grand Rivers, on eastern Oklahoma. On 1802, the Osage Native American tribe was awarded a monopoly on trading by the Spanish colonial authorities, who settled around this area and beyond. Later, the Three Forks became part of the United States when the Louisiana territory was sold by France to the US in 1803. Thanks to its strategic position at the confluence of three rivers, this area became the focus of trade on the new American Southwest.