Answer:
C.
Step-by-step explanation:
Weathering is defined as the process of breaking down of rocks, soils, and minerals.
Weathering that involves carbonic acid is a type of chemical weathering in which carbonic acid reacts with calcite to form limestone. For many years when carbonic acid has weathered so much limestone that it forms caves.
Hence, the correct option is C as it shows caves due to reaction with carbonic acid.