Final answer:
The copper gilt on Harmandir Sahib, known as the Golden Temple, was first placed by Maharaja Ranjit Singh, reflecting the temple's significance in Sikhism, founded by Guru Nanak Dev Ji.
Step-by-step explanation:
The sheets of copper gilt on Harmandir Sahib, also known as the Golden Temple, were first placed by Maharaja Ranjit Singh. The Golden Temple is a central spiritual site of Sikhism, a religion founded by Guru Nanak Dev Ji that emerged in the Punjab region of northwestern India in the fifteenth century. Guru Tegh Bahadur, the ninth of the Sikh Gurus, was executed by the Mughal emperor Aurangzeb, who sought to exert control over the Sikhs and their leaders. The correct answer to who first placed the copper gilt on Harmandir Sahib is A) Maharaja Ranjit Singh.