Explain the formation of ONE limestone surface feature and limestone underground feature.​

Limestone is mainly composed of the mineral calcium carbonate. The island experiences a tropical marine climate with rain falling most of the year, and high temperatures for most of the year. This abundance of water, heat and calcium carbonate are the exact requirements for the chemical weathering process of carbonation. In carbonation, rain mixes with carbon dioxide gas in the atmosphere to produce a weak acid called carbonic acid.

I'm pretty sure it's c. extremely gradual but not 100% sure though.