The Area in Dispute Between the United States and Britain $\degree$

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 $\degree$ 30' line and the Columbia River.
D) the forty-ninth parallel and the 54 $\degree$ 40' line.
E) the Columbia River, the forty-ninth parallel, and the Pacific Ocean.