The correct answer is (b) Only two
Explanation:
Devi Chandragupta : Bilhana
This pair is incorrectly matched. Devi Chandragupta is a play written by Vishakhadatta, not Bilhana.
Hammira-Mahakavya : Nayachandra Suri
This pair is correctly matched. Hammira-Mahakavya is a literary work written by Nayachandra Suri.
Milinda-panha : Nagarjuna
This pair is incorrectly matched. Nagarjuna did not write Milinda-panha. The Milinda-panha is a Buddhist text, and its authorship is uncertain.
Milinda-panha is a Buddhist text which dates from sometime between 100 BC and 200 AD. It purports to record a dialogue between the Indian Buddhist sage Nāgasena, and the 2nd century BC Indo-Greek king Menander I (Pali: Milinda) of Bactria
Nitivakyamrita : Somadeva Suri
This pair is correctly matched. Nitivakyamrita is a literary work written by Somadeva Suri.
The book Nitivakyamrita was written by Somadeva Suri, a Jain scholar in the 10th century AD. It is a treatise on niti or ethics and ethical values2.
Authenticative Reference Source:
To provide an authentic reference source for UPSC students, I would recommend referring to the following NCERT book:
"An Introduction to Indian Art" (Class XI) by NCERT, Chapter 5: "Architectural Developments in Ancient India."
Additionally, you can also refer to the official website of the Archaeological Survey of India (ASI) for information on ancient Indian history:
Official website of the Archaeological Survey of India: http://asi.nic.in/
Please note that while the NCERT books and the official ASI website are reliable sources, it is always advisable to cross-reference information from multiple sources for a comprehensive understanding.