Final answer:
Nadir Shah was assassinated on 20 June 1747, after a reign of consolidating power and expanding Persian influence.
Step-by-step explanation:
Nadir Shah, also known as Nader Afshar, was a powerful military ruler who deposed the last of the Safavid shahs and crowned himself in 1736, thus putting an end to the Safavid Empire. His reign included regaining Iranian territories from Russian and Ottoman hands, consolidating his control over Iran, and extending Persian influence. However, his rule became increasingly oppressive, and he was eventually assassinated on 20 June 1747, which is the correct answer to the student's question: a. 20 June 1747. Nadir Shah was assassinated on June 20, 1747. Nadir Shah was a ruler during the 18th century in Iran. He became the shah in 1736 after deposing infant Abbas III. Although Nadir Shah was able to reverse many territorial losses to the Russians and Ottomans, he was ultimately assassinated in 1747.