The Area in Dispute Between the United States and Britain

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

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