The correct answer is A. New Delhi.
The Indian Army is the land-based branch of the Indian Armed Forces. It is the largest standing army in the world, with over 1.4 million active personnel. The Indian Army is headquartered in New Delhi, and is commanded by the Chief of Army Staff.
The Indian Army is responsible for the defence of India against external threats. It has been involved in several wars and conflicts, including the Indo-Pakistani War of 1947, the Indo-Pakistani War of 1965, the Indo-Pakistani War of 1971, the Kargil War, and the ongoing insurgency in Jammu and Kashmir.
The Indian Army is a well-equipped and well-trained force. It is equipped with a variety of weapons and equipment, including tanks, armoured vehicles, artillery, and aircraft. The Indian Army is also well-trained in counter-insurgency and counter-terrorism operations.
The Indian Army is a professional and disciplined force. It is committed to the defence of India and the safety of its citizens. The Indian Army is a proud and respected institution, and plays a vital role in the security of India.
Option B, Mumbai, is the capital of Maharashtra and the most populous city in India. It is a major financial and commercial centre, and is home to the headquarters of several multinational corporations. However, the headquarters of the Indian Army is not located in Mumbai.
Option C, Kolkata, is the capital of West Bengal and the third most populous city in India. It is a major cultural and educational centre, and is home to the headquarters of several universities. However, the headquarters of the Indian Army is not located in Kolkata.
Option D, Chennai, is the capital of Tamil Nadu and the fourth most populous city in India. It is a major port city and a centre of automobile manufacturing. However, the headquarters of the Indian Army is not located in Chennai.