___________ connect India's four big metro cities of Delhi-Mumbai-Chennai-Kolkata.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Golden Quadrilateral.
The Golden Quadrilateral (GQ) connects India's four major metro cities: Delhi, Mumbai, Chennai, and Kolkata. It is a highway network launched under the National Highways Development Project (NHDP) and was initiated in 2001 under Prime Minister Atal Bihari Vajpayee. Covering 5,846 km, it enhances trade, transportation, and connectivity between these economic hubs. The project boosts industrial growth, reduces travel time, and strengthens infrastructure development, making it one of India’s most significant roadway networks.