Final answer:
The largest native upland game bird in Alberta is the Spruce Grouse. It is a forest-dwelling bird native to North America and adapted to cold climates. It is larger than the Ruffed Grouse and other introduced species like pheasants and Hungarian partridges.
Step-by-step explanation:
The largest native upland game bird found in Alberta is D) Spruce Grouse. The Spruce Grouse, also known as the Canada Grouse, is a forest-dwelling bird that is often found in the coniferous woods of North America, including the forests of Alberta. Unlike pheasants and Hungarian partridges, which were introduced species, the Spruce Grouse is native to the region and adapted to cold climates. Males are particularly notable for their dark plumage and red eyebrow combs. Though the Ruffed Grouse is also native and prevalent in Alberta's forested areas, the Spruce Grouse is larger in size, making it the correct answer to the question.