A line of latitude between the cities (B) is what would show that Minneapolis is further north than Albany.
Latitude is a geographic coordinate used to determine how far north or south you are on the surface of the earth. Lines of latitudes are parallel to one another, from the North Pole to the South Pole, with the equator in the middle.
If there is a latitude line stretching between Minneapolis and Albany, and that Minneapolis is above it while Albany is below it, that proves that Minneapolis is further north than Albany.