The correct answer is: a) High Himalayan ranges.
The northernmost physiographic zone of Arunachal Pradesh is characterized by high Himalayan ranges. The Himalayas are the highest mountain range in the world, and they form a natural barrier between India and China. The Himalayas are home to many glaciers and snow-capped peaks, and they are a popular destination for mountaineering and trekking.
The other options are incorrect because they do not accurately describe the northernmost physiographic zone of Arunachal Pradesh. Option b, rolling
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