In which of the following countries is commercial grain farming an important occupation?

Canada is one of the world's leading countries in commercial grain farming. The Canadian Prairies (Alberta, Saskatchewan, and Manitoba) form one of the largest commercial grain-producing regions in the world, with wheat being the principal crop. Canada is consistently among the top global exporters of wheat, barley, and canola.

Commercial grain farming is characterised by:

• Large-scale, highly mechanised operations covering vast areas of flat land.
• Production primarily for sale and export rather than subsistence.
• A temperate continental climate with warm summers suitable for grain cultivation.

Spain has a diversified agricultural sector including olives, wine, and fruits, but is not primarily known for commercial grain farming on the scale of Canada. Kenya's agriculture is dominated by cash crops (tea, coffee, flowers) and subsistence farming. Nigeria's agriculture is largely subsistence-based with some commercial crops (cocoa, palm oil, rubber), but not large-scale commercial grain farming in the way Canada practises it.