ANSWER ASAP! BEING TIMED! The image shows the US/British border dispute in the 1860s and early 1870s.

Which is the best interpretation of the US/British boundary dispute shown on the map?

The subject of the boundary dispute was Vancouver Island.
The San Juan Islands became part of British North America in 1872.
The San Juan Islands became part of Washington Territory in 1872.
The dispute was settled when Vancouver Island gave up the San Juan Islands.