The correct answer is: A. Jahangir
Durjan Sal was the ruler of Jharkhand from 1586 to 1605. He was imprisoned by the Mughal emperor Akbar in 1592. In 1605, Akbar’s son and successor, Jahangir, released Durjan Sal from prison due to his expertise in diamonds. Jahangir was a great admirer of diamonds and he wanted Durjan Sal to help him find and mine diamonds in Jharkhand. Durjan Sal was a valuable asset to Jahangir and he helped the emperor to find many valuable diamonds.
Humayun was the Mughal emperor from 1530 to 1540. He was the father of Akbar. Humayun was not the one who released Durjan Sal from prison.
Sher Shah Suri was the ruler of the Sur Empire from 1540 to 1545. He defeated Humayun and captured Delhi in 1540. Sher Shah Suri was not the one who released Durjan Sal from prison.
Akbar was the Mughal emperor from 1556 to 1605. He was the son of Humayun. Akbar imprisoned Durjan Sal in 1592.
Therefore, the correct answer is: A. Jahangir