In India, which organisation maintains the national highways?

Correct option is B

The correct answer is (b) National Highways Authority of India.
 The National Highways Authority of India (NHAI) is responsible for the development, maintenance, and management of national highways in India.
 NHAI operates under the Ministry of Road Transport and Highways.
 Established through the National Highways Authority of India Act, 1988, NHAI plays a crucial role in expanding and improving the national highway network.
 NHAI oversees various significant projects, including the Golden Quadrilateral and the North-South and East-West Corridors.
 The organization focuses on ensuring smooth and efficient transportation across the country.