The correct answer is D. Quaternary.
The North-Western hills were formed during the Quaternary period, which is the most recent geological period. The Quaternary period began about 2.6 million years ago and is still ongoing. It is divided into two epochs: the Pleistocene epoch and the Holocene epoch. The Pleistocene epoch was a time of glaciation, when large areas of the Earth were covered in ice. The Holocene epoch is the current epoch, and it is a time of global warming.
The North-Western hills are a mountain range in the Indian subcontinent. They are located in the states of Jammu and Kashmir, Himachal Pradesh, Uttarakhand, and Punjab. The North-Western hills are part of the Himalayas, which are the highest mountain range in the world.
The North-Western hills are a popular tourist destination. They are known for their beautiful scenery, their snow-capped peaks, and their lush forests. The North-Western hills are also home to a number of important historical and religious sites.
The North-Western hills are a valuable resource for the Indian subcontinent. They provide a source of water, timber, and minerals. The North-Western hills are also an important part of the Indian ecosystem. They provide habitat for a variety of plants and animals.
The North-Western hills are a beautiful and important part of the Indian subcontinent. They are a popular tourist destination, a valuable resource, and an important part of the Indian ecosystem.
The other options are incorrect because they are not periods of geological time. The Dharwar period was a period of geological time that lasted from about 2.5 billion to 540 million years ago. The Tertiary period was a period of geological time that lasted from about 66 million to 2.6 million years ago. The Vindhyan period was a period of geological time that lasted from about 1.9 billion to 800 million years ago.