Indigenously build supersonic cruise missile is known as:

The correct answer is option 'A' - Brahmos.

Explanation:

1. Supersonic cruise missile:
- A supersonic cruise missile is a missile that can travel faster than the speed of sound.
- It is designed to deliver a payload to a specific target with high precision and accuracy.

2. Brahmos missile:
- The Brahmos missile is an indigenously built supersonic cruise missile jointly developed by India and Russia.
- It is named after the Brahmaputra River in India and the Moskva River in Russia.
- The name Brahmos is a combination of the names of both rivers.

3. Features of Brahmos missile:
- The Brahmos missile is capable of traveling at a speed of Mach 2.8, which is approximately 2,187 miles per hour.
- It has a range of around 300 kilometers (186 miles).
- The missile is capable of carrying a conventional warhead of up to 300 kilograms (660 pounds).
- It can be launched from multiple platforms, including land, air, and sea.
- The missile is known for its high precision and accuracy, making it highly effective in modern warfare.

4. Importance of Brahmos missile:
- The Brahmos missile has significant strategic importance for India as it provides a strong deterrent against potential adversaries.
- Its supersonic speed and long-range capabilities make it difficult for enemy defenses to intercept or counter.
- The missile's versatility allows it to be used in various operational scenarios, including anti-ship, anti-submarine, and land-attack missions.
- The successful development and deployment of the Brahmos missile showcase India's technological prowess and self-reliance in defense production.

5. Other options:
- Prithvi, Nag, and Astra are other missile systems developed by India, but they are not supersonic cruise missiles.
- Prithvi is a short-range ballistic missile, Nag is an anti-tank guided missile, and Astra is an air-to-air missile.

In conclusion, the indigenously built supersonic cruise missile known as Brahmos is a significant achievement for India and Russia. Its speed, range, and precision make it a formidable weapon in modern warfare.