Which of the following best describes the course of the Mississippi River?
A.Crossing most of the northern plains, this river flow across the Rocky Mountains to dump into the Gulf of California.
B.Arising in the northern plains, this river flows through states between the Appalachian and Rocky Mountain ranges and dumps into the Gulf of Mexico.
C. Crossing areas in over seven states, this river carves its way across the western plains into northwestern Mexico and the Gulf beyond.
D. Arising in central Florida, this river is one of two navigated and heavily traveled rivers in the world that flow north.