Explanation
India's Golden Triangle tourist circuit connects three major cities: A) Jaipur, B) Delhi, and D) Agra.
C) Lucknow is not part of the Golden Triangle circuit. The Golden Triangle forms a triangular route in northern India, covering the cities of Delhi, Agra (home to the Taj Mahal), and Jaipur (known for its historic forts and palaces). Lucknow, although a significant city in Uttar Pradesh, is not part of the traditional Golden Triangle circuit.