The correct answer is option 3, Ganga. The Ganga river, also known as the Ganges, has been declared as the National River of India. It holds significant cultural and religious importance in the country. The river is worshipped by millions of people and is considered sacred in Hinduism. It originates in the Himalayas and flows through several states in northern India before ultimately emptying into the Bay of Bengal. The government of India has recognized the need to protect and preserve this iconic river due to its ecological, cultural, and economic significance. The declaration of Ganga as the National River highlights its importance and calls for measures to ensure its cleanliness and conservation.