Solution:National Heritage City Development and Augmentation Plan (HRIDAY) was started on 21st January, 2015 with an objective of bringing together urban planning, economic development and heritage conservation in an inclusive manner to preserve the heritage character of each heritage city.In which 12 cities of the country- Ajmer (Rajasthan), Amaravati (Andhra Pradesh), Amritsar (Punjab), Badami (Karnataka), Dwarka (Gujarat), Gaya (Bihar), Kancheepuram and Velankanni (Tamil Nadu), Mathura and Varanasi (Uttar Pradesh), Puri (Odisha) and Warangal (Telangana) have been included. Agra was not included in these cities. Hence option (a) is the correct answer.