The Taiga biome, also known as the boreal forest, is a sub-Arctic biome characterized by coniferous forests. It spans across the northern regions of North America, Europe, and Asia, just south of the Arctic tundra. The Taiga is the world's largest terrestrial biome and is adapted to cold climates with long winters and short summers. Options B (sub-Saharan) and C (savanna grass) are incorrect as they refer to tropical regions.