Which of the following is a true statement about the map? A. The border between Canada and North Dakota is a thick, black line; this indicates an international boundary. B. The border between Montana and North Dakota is a thin, black line, this indicates an international boundary. C. The border between Montana and North Dakota is a thin, blue line; this indicates a state boundary. D. The border between Canada and North Dakota is a thin, black line; this indicates an international boundary.