Which of the following is one of the two longest rivers in the United States?

The Mississippi River is one of the two longest rivers in the United States, making this choice correct. Flowing over 2,300 miles, it starts from Lake Itasca in Minnesota and travels down to the Gulf of Mexico. The river is an essential part of American history and culture, serving as a critical transportation route, a resource for agriculture, and a setting for countless events in literature and the arts.

The other rivers listed, such as the Amazon, Nile, and Yangtze, are indeed significant rivers globally but do not flow within the United States. The Amazon River is located in South America, the Nile runs through northeastern Africa, and the Yangtze is in China. Their inclusion in the options highlights their importance but does not relate to the question regarding U.S. waterways. This emphasizes the distinctiveness of the Mississippi River within the context of U.S. geography.