Final answer:
The terrain to the east of the Yenisei River includes the central Siberian Plateau with extensive taiga or boreal forests, and further east, the mountainous region of the Kamchatka Peninsula. Towards the Arctic Sea, there is tundra. The correct answer is C
Step-by-step explanation:
The terrain located east of the Yenisei River includes both the central Siberian Plateau and a vast region of taiga or boreal forests. These forests are one of the world's largest areas of coniferous forest and part of a biome dominated by trees adapted to cold environments. Further east, the terrain becomes mountainous, particularly in the Kamchatka Peninsula with its many active and inactive volcanoes. Beyond the forests, towards the northern coast of the Arctic Sea, one can find the tundra biome, characterized by perma frost, extreme cold, and a short growing season. The correct answer is C