What is the most popular series of the Deccan miniature paintings?

Ragmala series

The correct answer is Option 3- Ragmala series

These feminine dress, present in a series of Ragamala paintings, are the most striking and moving examples of the sixteenth century Deccan Schools of Painting.

Paintings from Bijapur in the sixteenth century have a richly illustrated encyclopaedia known as the Nujum al-Ulum dated 1570. Among the 876 miniatures, which adorn this remarkable little volume, many illustrate weapons and utensils, while others the constellations. The women are shown in south Indian dress, tall and slender as those in the Ragamala paintings. The school of Bijapur was patronised by Ali Adil Shah I (1558–1580) and his successor Ibrahim II (1580–1627), both patrons of art and literature. The latter was also an expert in Indian music and author of a book on this subject, Nauras-nama. He was the owner of Nujum al-Ulum manuscript and might have commissioned the Ragamala series in the 1590s. Bijapur had a close connection with Turkey and astronomical illustrations in Nujum al-Ulum may have been derived from Ottoman Turkish manuscripts. The Ragamala are, as we have seen, Indian in their connections, with definite echoes of the Lepakshi style. They exemplify the luxuriant aestheticism of the Adil Shah court in their daring and brilliantly successful colouring and vigour of simplified compositions. 

An intriguing work in the collection of National Museum, New Delhi, titled Ragini Pathamsika of Raga Hindola, an important member of the Ragamala family of the Indian musical mode, dates back to around 1590–95.