Answer:
D. Chemical weathering or Water Erosion!
Explanation:
These Limestone caves are formed primarily by rainwater and snowmelt. Rainwater and snowmelt seeping into the ground absorb large amounts of carbon dioxide, which is a product of decaying organic matter. The water and carbon dioxide together form carbonic acid, which makes the form of the limestone cave! Hope this helped!
I think that it is c just because it seems to fit the sentence
Tri means three like in triangle a triangle has three points
