本题考查英国的降雨分布带来的影响。
As a result of the rainfall distribution in Britain there is a water surplus in the north and west, and a water deficit in the south and east. Reservoirs have therefore to be built in such highland areas as Central Wales, the Lake District and the Scottish Highlands, so that water can be stored here and then transferred to the more populated and industrial areas of lowland Britain.
由于英国的降雨分布，北部和西部的水资源过剩，而南部和东部的水资源短缺。因此，必须在威尔士中部、湖区和苏格兰高地等高地地区修建水库，以便将水储存在这里，然后转移到英国低地人口较多、工业较发达的地区。
故选择C选项。