This question has options. Select from options: Read this fact: "a cavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone"

Now answer this question: "A woman visits the same beach year after year, and begins to notice a change to a large wall of stone. Where the water touches the rock, she notices that the rock shows signs of being dissolved. After two year, there is an indent in the rock. After fifty years, the woman discovers that the rock"

Pick from:
1). is now an underground chamber;
2). is now solid gold;
3). is now about to explode;
4). is now much bigger;
1).