The correct answer is: a) Rare manuscripts and books.
The Saraswathi Mahal Library is a library in Thanjavur, India. It is one of the oldest libraries in India and is renowned for its collection of rare manuscripts and books. The library was founded in 1682 by the Maratha king Serfoji II. It houses a collection of over 49,000 manuscripts and books, including some that are over 1,000 years old. The library is open to the public and is a popular tourist destination.
The other options are incorrect. Mughal paintings are a type of Indian painting that was developed during the Mughal Empire. Folk art is a type of art that is created by people who are not professional artists. Modern sculptures are sculptures that were created in the 20th or 21st centuries.