Question

identifying features caused by groundwater erosion
which image shows karst topography?

Explanation:

Karst topography is formed by groundwater erosion (chemical weathering of soluble rocks like limestone). The top image likely shows features like sinkholes, caves, or underground drainage (e.g., a cave with water - eroded channels), typical of karst. The middle might be a non - karst water - related feature, and the bottom a waterfall (fluvial, not karst - specific). So the top image represents karst topography.

Answer:

The Top Image