Explanations:Inland waterways are a critical part of the transportation infrastructure in many countries, including India. They consist of navigable rivers, canals, and other water bodies that are used for the movement of goods and people. The term "inland waterways" is broader than "rivers" or "canals" alone, as it includes all water bodies that are used for inland navigation.
The list provided includes several examples of inland waterways. Mandavi, Zuari, and Cumberjua are rivers that are used for navigation. The Sunderbans is a vast delta region with numerous tidal rivers and creeks that are navigable. The Barak River is another navigable river. The backwaters of Kerala are a network of interconnected canals, rivers, and lakes that are used for transportation. Tidal stretches refer to areas where the water level changes due to tidal action, often making them navigable.
It is important to understand that while rivers and canals are components of inland waterways, not all rivers or canals are necessarily part of a designated national waterway system. National waterways are specific inland waterways that have been officially designated by the government for development and maintenance to enhance their navigational capabilities. However, the term "inland waterways" is more inclusive and encompasses all navigable water bodies within a country, regardless of their official designation.
Therefore, the correct answer is "Inland waterways" because it accurately describes the nature of the listed water bodies, which are all used for inland navigation and transportation.