The correct answer is (a) Lakhu Udyar.
Lakhu Udyar is a prehistoric era site located in the Chamoli district of Uttarakhand, India. It is a rock shelter that contains evidence of human habitation from the Mesolithic period. The site was discovered in 1978 by a team of archaeologists from the Archaeological Survey of India.
The excavations at Lakhu Udyar have revealed a number of artifacts, including stone tools, pottery, and animal bones. The stone tools are made of chert and quartz and include a variety of types, such as scrapers, points, and blades. The pottery is handmade and decorated with simple geometric designs. The animal bones belong to a variety of species, including deer, cattle, and sheep.
The evidence from Lakhu Udyar suggests that the site was occupied by a small group of hunter-gatherers. The people who lived at Lakhu Udyar were skilled in the manufacture of stone tools and pottery. They also had a knowledge of animal husbandry.
Lakhu Udyar is an important archaeological site that provides evidence of human habitation in the Indian subcontinent during the Mesolithic period. The site is a valuable resource for understanding the lives of early hunter-gatherers in India.
The other options are incorrect because they are not prehistoric era sites located in Uttarakhand. Kalibanga is a Harappan site located in Rajasthan, India. Alamgirpur is a Harappan site located in Uttar Pradesh, India.