Answer:
Option (B)
Step-by-step explanation:
The groundwater refers to the flowing water channel below the earth's surface at a certain depth.
The rainwater is acidic in nature and as it occurs over an area, the water percolates deep into the ground through the pore spaces and fractures, which eventually mixes with the groundwater. As this groundwater flows, it carries various types of minerals with them and the water comprised of acid reacts with the carbonate rock in the region where there are abundant carbonate rocks such as limestone. Due to this dissolution of carbonate rocks, the underground caves are formed.
Thus, the correct answer is option (B).