NEERI is

Options

A. National Environmental Engineering Research Institute, Nagpur
B. National Ecological and Enviornmental Research Institute, Pune
C. National Engencies and Ecological Research Institute, Mumbai
D. National Ethological and Ecological Research Institute , New Delhi

Explanation

**Step-by-Step Text Solution:**

1. **Understanding NEERI**: NEERI stands for National Environmental Engineering Research Institute. It is an institute established by the Indian government.

2. **Purpose of NEERI**: The primary focus of NEERI is to study the effects and causes of pollution, as well as to develop methods for its prevention. The institute plays a crucial role in environmental research and improvement.

3. **Location of NEERI**: NEERI has several laboratories located in different cities across India. The key locations include:
- **Delhi**: The capital city, known for its extensive laboratory facilities.
- **Mumbai**: A major metropolitan area with significant industrial activity.
- **Chennai**: A prominent city in southern India.
- **Hyderabad**: Known as a tech city, it also hosts one of the NEERI laboratories.
- **Kolkata**: A major cultural and economic hub in eastern India.

4. **Conclusion**: Therefore, the full form of NEERI is National Environmental Engineering Research Institute, which is located in Nagpur, India.