Correct Option: A

Nadir Shah of Iran invaded India in 1739 and sacked Agra and Delhi. Along with the Peacock Throne, he also carried off the Koh-i Noor to Persia in 1739. It was allegedly Nadir Shah who exclaimed Koh-i Noor! when he finally managed to obtain the famous stone, and this is how the stone gained its present name. There is no reference to this name before 1739.