(A) Norway
(B) South Korea
(C) Italy
(D) Croatia
🧠 Explanation:
- No country joined the European Union in January 2023, as EU expansions are infrequent and require extensive accession processes.
- Croatia became a full member of the EU in July 2013, not in January 2023.
- Other options like Norway have never been full EU members, and South Korea is not even an EU candidate, while Italy is a founding member since 1958.
- Therefore, none of the listed countries became EU members in January 2023.