Which one of the following statements best reflects the most logical, rational and practical suggestion implied by the passage?

Correct Option: (b) This can be used as one of the methods of carbon sequestration.

The passage describes an experiment where pumping carbon dioxide and water into underground basalt rocks results in the acidic mixture dissolving calcium and magnesium, converting carbon dioxide into limestone (stone). Since the process successfully converts gaseous carbon dioxide into a solid, stable form (limestone), it provides a practical method for carbon sequestration, which is the long-term storage of carbon dioxide to mitigate global warming. Option (b) is the most logical, rational, and practical suggestion. Option (a) is incorrect because the passage does not discuss the commercial viability or cost-effectiveness of producing limestone for building. Option (c) is incorrect because basalt rocks are not being used as a source to extract minerals, but rather as a sink to store carbon. Option (d) is incorrect because producing acid is only an intermediate step, not the primary goal or practical suggestion of the experiment.