Under the Anglo - Irish Treaty, Britain established _______ with dominion status in Ireland in 1921.
A、the Anglican Church of Ireland
B、the Irish Free State
C、the Irish Republican Army
D、the Anglo-Irish Intergovernmental Council
【正确答案】：B
【题目解析】：根据《盎格鲁-爱尔兰条约》，英国于1921年在爱尔兰建立了具有自治领地位的爱尔兰自由邦。