The correct answer is: c) Both passengers and cargo.
Inland waterways are used for transporting both passengers and cargo. They are a cost-effective and environmentally friendly way to move people and goods. Inland waterways are particularly well-suited for transporting bulk cargo, such as coal, grain, and oil. They are also used to transport passengers, both on short-distance ferries and on long-distance cruise ships.
Option a) is incorrect because inland waterways are used to transport both passengers and cargo. Option b) is incorrect because inland waterways are used to transport both passengers and cargo. Option d) is incorrect because inland waterways are used to transport both passengers and cargo.