Concept:Features of a river vary by course; the lower course is dominated by deposition, not steep erosion.Explanation:A V-shaped valley is formed by vertical erosion and is typical of the upper course of a river.In the lower course, the river flows over gentle gradients, so it deposits sediments.Features like flood plains, levees, and ox-bow lakes all develop from deposition and lateral erosion in the lower course.Since the question asks for the feature that is NOT of the lower course, the V-shaped valley is the exception.Answer:B. V-shaped valley