How many parts of the Ain-i-Akbari of Abul Fazl?

The correct answer is Option (4) → Three

Note: The given answer is as per the official NTA Answer Key. However, none of the given options appears to be correct, because the Ain-i-Akbari itself is divided into five books, as explained below.

Abul Fazl, a courtier of Akbar, wrote the official history of Akbar’s reign, the Akbar Nama. It is divided into three books: the first two are chronicles of events, the second ending in the forty-sixth year of Akbar’s reign (1601), and the third is the Ain-i-Akbari, completed in 1598, an account of the administration, the army, the revenue system, the provinces and the people of the empire.

The Ain-i-Akbari itself is divided into five books (daftars), of which the first three describe the administration of the empire. The number three belongs to the Akbar Nama, of which the Ain is the third book.