Explanation:

- Bodh Gaya (Option 2): This is the correct answer. ?? Buddha attained enlightenment under the Bodhi Tree here. It is a revered pilgrimage site in Bihar, India.

- Varanasi (Option 1): Known for the first sermon of Buddha at Sarnath, not the place of enlightenment. It is a major religious and cultural hub.

- Kusinara (Option 3): The place where Buddha attained Parinirvana (passed away), located in present-day Kasia, Uttar Pradesh, India.

- Pataliputra (Option 4): Ancient city, known today as Patna, was significant in Indian history and Buddhism but not related to enlightenment.