Concept:A river that flows into Lake Volta must be a tributary of the Volta River system.Explanation:Lake Volta is formed by the Akosombo Dam on the Volta River.Major rivers feeding Lake Volta include the Afram, Oti, and White Volta rivers.The Afram River flows directly into Lake Volta.Pra, Densu, and Tano rivers flow into the sea or other basins in southern Ghana, not into Lake Volta.Answer:A. Afram