The correct answer is (b), Norway.
Norway is the first country to import carbon dioxide and bury it under sea. The project, called Northern Lights, is a joint venture between Equinor, Shell, and Total. It began in 2018 and is expected to store up to 1 million tonnes of carbon dioxide per year.
The carbon dioxide is captured from industrial sources in Norway and transported by ship to the North Sea, where it is injected into a saline aquifer at a depth of 2,600 meters. The aquifer is located in a geological formation that is well-suited for carbon storage, as it is impermeable and has a low risk of leakage.
The Northern Lights project is a significant step forward in the development of carbon capture and storage (CCS) technology. CCS is a key part of the effort to reduce greenhouse gas emissions and mitigate climate change.
The other options are incorrect. Denmark, Sweden, and Belgium are not known to have any plans to import carbon dioxide and bury it under sea.