The correct option is D
The Ohio is a river of the east of the United States that flows in southeasterly by the states of Pensilvania, Ohio, Indiana, Illinois - forms the southern limit of these three last ones, West Virginia and Kentucky - forms the northern limit of these two - Draining in the Mississippi River near the city of Cairo (Illinois). It has a length of 1579 km, but with one of its sources, the Allegheny River, it reaches 2108 km, which places it among the 10 largest rivers in the United States. It drains a basin of 490 601 km², out of a total of 14 states, most of the northeast of the country.
It has a major importance in the history of the United States, both for the Amerindian tribes and for the European settlers, since it was a privileged transportation route during the conquest of the West. Its main tributaries are the Tennessee, on the left, and the Wabash, on the right. In the eighteenth century it constituted the southern frontier of the northern states, de facto marking the boundary between the states that practiced slavery and those that had abolished it.
