Answer:
(a) Only one
Explanation:
In 2023, only one of the listed properties was included in the UNESCO World Heritage List, which is:
Shantiniketan: Shantiniketan, the cultural and educational institution established by Rabindranath Tagore in West Bengal, India, was added to the UNESCO World Heritage List in 2023.
The other properties, namely Rani-ki-Vav (added in 2014), Sacred Ensembles of the Hoysalas, and Mahabodhi Temple Complex at Bodhgaya (added in 2002), were already included in previous years. Therefore, the correct answer is (a) Only one.