Answer :
The correct option is- it is physically separate from the rest of the United Kingdom, a multinational state.
What happened during and after making of northern Ireland?
The region of Southern Ireland departed the United Kingdom and established the Irish Free State, later known as the Republic of Ireland, on December 6, 1922, one year after the Anglo-Irish Treaty was signed.
Within the Irish province of Ulster, the region that would become Northern Ireland had a Protestant and Unionist majority that desired to keep ties to Britain.
This was largely because of British colonization in the 17th century. It also included a sizable proportion of Catholics and Irish nationalists, though.
The First World War ended the crisis when the British administration intended to exclude all or part of Ulster (1914–18).
The Irish War of Independence ended in a truce in July 1921, and the Anglo-Irish Treaty was signed in December of the same year.
The Free State could be accepted or rejected by the Northern Ireland parliament, and a commission could then redo or uphold the temporary boundary.
The IRA attempted a failed invasion of Northern Ireland's border regions in the beginning of 1922. The Northern government decided to stay in the United Kingdom.
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