The correct answer is option 'D' - Himalaya.

Explanation:

The Himalaya range is the youngest range in India. Here's a detailed explanation of why it is the youngest:

1. Formation:
The Himalayas were formed due to the collision of the Indian and Eurasian tectonic plates. This collision began around 50 million years ago and is still ongoing today. The immense pressure and force generated by the collision caused the Earth's crust to buckle and fold, resulting in the formation of the Himalayas.

2. Age:
The Himalayas are relatively young compared to other mountain ranges in India. The process of their formation started around 50 million years ago, which is considered quite recent in geological terms.

3. Height:
The Himalayas are known for their towering peaks, including Mount Everest, which is the highest peak in the world. The range is still actively growing, with the highest peaks continuing to rise in height due to ongoing tectonic activity.

4. Tectonic Activity:
The Himalayas are characterized by intense tectonic activity. The Indian plate is continuously moving northward and colliding with the Eurasian plate. This ongoing collision results in frequent earthquakes and the formation of new mountain ranges within the Himalayan system.

5. Geology:
The Himalayas are composed of a variety of rocks, including sedimentary, metamorphic, and igneous rocks. These rocks were formed during different geological periods and have been uplifted and folded during the mountain-building process.

Conclusion:
In summary, the Himalayas are the youngest range in India due to their recent formation as a result of the ongoing collision between the Indian and Eurasian tectonic plates. The range continues to grow in height and experience tectonic activity, making it a dynamic and geologically significant region.