The correct option is B Youthful stage, mature stage and old stage
The journey of a river has three stages: youthful, mature, and old stage. These stages are also called upper course, middle course, and lower course. In the youthful stage, the river is full of energy and power. In the mature stage, the flow is relatively slower than in the youthful stage. In the old stage, it loses a lot of its bustling, youthful energy and flows slowly and calmly.