B) Ireland
The 'Potato Famine' (1845–49) occurred in Ireland, where potato crop failure caused mass starvation and emigration.
The Irish Potato Famine (also called the Great Famine) is mentioned in the context of 19th-century European hardships and migrations discussed in Class 10 History. Potato was the staple food of the Irish poor; when blight destroyed the crop, about one million died and another million emigrated. This is a standard factual question — remember the country is Ireland, not England or Scotland.