The Area in Dispute Between the United States and Great

The area in dispute between the United States and Great Britain in 1845 lay between the  

A) forty-second parallel and the Columbia River.
B) Cascade Mountains, the Columbia River, and Puget Sound.
C) 36° 30' line and the Columbia River.
D) forty-ninth parallel and the 54° 40' line.
E) Columbia River, the forty-ninth parallel, and the Pacific Ocean.