Explanations:The Ganga Plain, also known as the Gangetic Plain, is a vast alluvial plain that stretches across northern India. It is formed by the alluvial deposits of the Ganga River and its tributaries, such as the Yamuna, Gomti, and Ghaghara. The plain is one of the most fertile and densely populated regions in India, and it plays a significant role in the country's agriculture and economy.
The Ganga Plain extends through several Indian states, including Bihar, Delhi, and West Bengal. Each of these states has a portion of the plain within its boundaries, and the Ganga River flows through or near these states, contributing to the formation of the plain. The plain is characterized by its flat terrain, rich soil, and extensive agricultural activities.
In Bihar, the Ganga Plain covers a significant portion of the state, particularly in the eastern and central regions. The river flows through the state, and the alluvial deposits have created a fertile agricultural landscape. In Delhi, the plain is less extensive but still present, particularly in the northern and eastern parts of the city. The Yamuna River, a major tributary of the Ganga, flows through Delhi and contributes to the formation of the plain in this region.
West Bengal is another state where the Ganga Plain is prominent. The river flows through the state, and the plain extends across the northern and eastern parts of the state. The delta region of the Ganga, known as the Sundarbans, is also part of the Ganga Plain and is a unique ecosystem with mangrove forests and diverse wildlife.
Therefore, the Ganga Plain extends through all the mentioned states: Bihar, Delhi, and West Bengal. This makes option D, "All of the above," the correct answer. Understanding the geographical extent of the Ganga Plain is crucial for comprehending the agricultural, economic, and ecological significance of this region in India.