本题考查英国最大的湖泊。
Most of the large lakes in the UK are located in the upland areas of the Scotland and northern England, although Lough Neagh in Northern Ireland is the largest lake in the UK.
英国大部分湖泊都位于苏格兰高地和英格兰北部，不过英国最大的湖泊是位于北爱尔兰的内伊湖。
故选择C选项。