The outermost range of the Himalayas is the Shivalik, which ranges between 900 and 1100 metres in height, and lies in width between

Correct option is A

The correct answer is (A)  ​10 and 50 km

• ​The width of the Shivalik range varies between 10 to 50 kilometers.​
  

Information booster:

• ​The Shivalik Range, also known as the Outer Himalayas, forms the southernmost and lowest section of the Himalayan mountain system.
• The Shivalik hills rise to an elevation of 900 to 1,100 meters above sea level.
• These ranges stretch from the Indus River in the west to the Brahmaputra River in the east.
• Found in parts of India, Nepal, and Bhutan.
• The Shivalik range acts as a transition zone between the plains and the higher Himalayan ranges.
• It includes dun valleys, such as the Dehradun and the Patli Dun, which are fertile and densely populated.
• The Shivaliks are an important part of the Himalayan ecosystem and are crucial for water resources, biodiversity, and agriculture in the adjoining regions.​