The correct answer is: a) Lalitgiri, Ratnagiri, Udayagiri.
Lalitgiri, Ratnagiri, and Udayagiri are three Buddhist monastic complexes located in the Indian state of Odisha. They are part of the Mahameghavhana group of monasteries, which were built during the Gupta period (320-550 CE). The complexes are located on a hill range about 100 kilometers from Bhubaneswar, the capital of Odisha.
Lalitgiri is the largest of the three complexes. It has a number of stupas, temples, and monasteries. The most important monument at Lalitgiri is the Mahachaitya, a large stupa that is said to contain the relics of the Buddha.
Ratnagiri is the second largest of the three complexes. It has a number of stupas, temples, and monasteries. The most important monument at Ratnagiri is the Ratnagiri Chaitya, a large stupa that is said to contain the relics of the Buddha’s disciples.
Udayagiri is the smallest of the three complexes. It has a number of caves that were used as monasteries. The most important cave at Udayagiri is the Udayagiri Cave 1, which has a number of sculptures depicting the life of the Buddha.
The Buddhist monastic complexes at Lalitgiri, Ratnagiri, and Udayagiri are important archaeological sites. They provide evidence of the spread of Buddhism in India during the Gupta period. The complexes are also important pilgrimage sites for Buddhists.