Question

identifying features caused by groundwater erosion
which image shows karst topography?
(three images are shown with radio buttons below them, and the third image has a caption: photo courtesy of the ministry of land, infrastructure and transport of japan)

Explanation:

Karst topography is formed by groundwater erosion of soluble rocks (like limestone), creating features like caves, sinkholes, or underground drainage. The first image is a beach (coastal feature), the third is a meandering river (fluvial feature). The middle image shows a cave, a key karst feature from groundwater erosion.

Answer:

The Middle Graph (the image of the cave)