Explanations:The primary mode of public transport in Delhi is the Metro rail system. This system is a crucial part of the city's transportation infrastructure and is designed to provide efficient, reliable, and fast transport to a large number of people. The Delhi Metro, which began operations in 2002, has grown significantly over the years and now covers a vast network across the city, connecting major residential, commercial, and industrial areas.
The Metro rail system is preferred over other modes of transport for several reasons. Firstly, it is highly efficient and operates on a dedicated track, which means it is not affected by traffic congestion. This makes it a faster mode of transport compared to buses and taxis, which can be delayed by traffic. Secondly, the Metro is known for its reliability, with trains running on a strict schedule and minimal delays. This makes it a preferred choice for commuters who need to reach their destinations on time.
While other modes of transport such as buses, taxis, and auto-rickshaws are also widely used in Delhi, they do not offer the same level of efficiency and reliability as the Metro. Buses, for example, are often slower due to traffic congestion and may not be as punctual. Taxis and auto-rickshaws are more suitable for individual or small group travel and are not designed for large-scale public transport needs.
Therefore, the Metro rail system is the primary mode of public transport in Delhi, making it the correct answer to the question. It is an essential part of the city's transport network and plays a significant role in facilitating the movement of people across the city.