Answer:

The correct answer is option 'A', Andhra Pradesh. The largest private sector sea port in India, called Krishnapatnam Port, has been commissioned recently in Andhra Pradesh. Let's explore the details below.

Background:
- Krishnapatnam Port is located in Nellore district of Andhra Pradesh.
- It is a privately built and owned port, operated by Krishnapatnam Port Company Limited (KPCL).
- The port is strategically located on the east coast of India, near the Bay of Bengal.

Features and Significance:
- Krishnapatnam Port is the largest private sector sea port in India.
- It has a natural draft of 18.5 meters, making it capable of handling large vessels and allowing easy access for trade.
- The port has a capacity to handle about 200 million tonnes of cargo annually.
- It is equipped with state-of-the-art infrastructure and modern handling facilities to handle a wide range of cargo, including containers, bulk, liquid, and project cargo.
- The port also has dedicated terminals for coal, iron ore, and container handling, making it a multi-purpose port.
- Krishnapatnam Port plays a crucial role in boosting trade and commerce in the region, as well as contributing to the overall economic growth of the country.
- It provides employment opportunities and generates revenue for the state and local communities.

Benefits:
- The commissioning of Krishnapatnam Port has brought numerous benefits to the region and the country as a whole. Some of these benefits include:
- Increased trade and exports: The port provides a gateway for exports, promoting trade and boosting the economy.
- Decongestion of other ports: With its large capacity, Krishnapatnam Port helps in reducing the burden on other ports, which are often congested.
- Infrastructure development: The establishment of the port has led to the development of supporting infrastructure in the region, such as road and rail connectivity, warehouses, and logistics facilities.
- Employment generation: The port has created job opportunities for the local population, contributing to their socio-economic development.
- Foreign direct investment (FDI): The presence of a world-class port attracts foreign investors and encourages FDI in the region.

Conclusion:
In conclusion, the largest private sector sea port in India, Krishnapatnam Port, has been recently commissioned in Andhra Pradesh. The port's strategic location, modern infrastructure, and large handling capacity make it a significant contributor to the country's trade and economic growth.