The Himalayas consist of three parallel ranges in its longitudinal extent. The northern-most range is called the Himadri.

The Himalayas, one of the most iconic mountain ranges in the world, stretches across several countries including India, Nepal, Bhutan, and Tibet. It is a vast mountain system that spans approximately 2,400 kilometers from east to west. Within this longitudinal extent, the Himalayas are divided into three parallel ranges.

The Three Parallel Ranges of the Himalayas:
1. The Outer Himalayas or the Shivaliks: This is the southernmost range of the Himalayas. It is also known as the Shivalik Range, which means "the tresses of Lord Shiva." The Shivaliks are a relatively lower range compared to the other two ranges and are characterized by their foothills and gentle slopes. They act as a transition zone between the plains and the higher mountains.

2. The Lesser Himalayas or the Himachal: The Lesser Himalayas lie to the north of the Shivaliks. This range is often referred to as the Himachal Range. It is a middle-level range with higher peaks and steeper slopes compared to the Shivaliks. The Lesser Himalayas are home to several popular hill stations and are known for their scenic beauty.

3. The Great Himalayas or the Himadri: The Great Himalayas, also called the Himadri, are the highest and northernmost range of the Himalayas. This range comprises the highest peaks in the world, including Mount Everest, Kanchenjunga, and Makalu. The Himadri is characterized by its towering peaks, snow-covered slopes, and immense glaciers. It acts as a natural boundary between the Indian subcontinent and the Tibetan Plateau.

The Northern-Most Range:
Among the three parallel ranges, the northern-most range is called the Himadri or the Great Himalayas. It is the highest and most significant range in the Himalayas. The Himadri forms an imposing barrier that separates the Indian subcontinent from the cold and arid Tibetan Plateau. It plays a crucial role in shaping the climate and weather patterns of the region.

Conclusion:
In conclusion, the northern-most range of the Himalayas is known as the Himadri. It is the highest and most prominent range in the Himalayan mountain system. The Himadri, along with the Lesser Himalayas and the Shivaliks, form a unique and awe-inspiring landscape that has captivated people for centuries.

The Humari option B is right