The correct answer is option 3, the Himalayas. The Himalayas are a mountain range located in Asia, specifically in Nepal, Bhutan, India, Pakistan, and Tibet. They are referred to as `Young Fold Mountains` because they were formed relatively recently in geological terms. The Himalayas were created by the collision of the Indian tectonic plate with the Eurasian tectonic plate around 50 million years ago. This collision caused the rocks to fold and uplift, forming the high peaks and steep valleys that we see today. The Himalayas are still actively growing, with some of the highest peaks in the world, including Mount Everest. The other options listed, the Aravallis, Nilgiris, and Vindhyas, are also mountain ranges in India but they are much older and not considered `Young Fold Mountains`.