Final answer:
Maharaja Ranjit Singh made an offering of Rs.11000 for the service of the holy tank at Harmandir Saheb.
Step-by-step explanation:
The individual who made an offering of Rs.11000 for the service of the holy tank at Harmandir Saheb is Maharaja Ranjit Singh. Harmandir Saheb, also known as The Golden Temple, is a highly significant place of worship for the Sikh religion. Maharaja Ranjit Singh was a prominent leader of the Sikh Empire in the early 19th century and is known for his patronage of arts, culture, and various religious endeavors, including the embellishment of the Harmandir Saheb with rich marble and the iconic gold facade. Diwan Koura Mal, Raja Ranjit Singh, and Diwan Kaura Singh are other historical figures associated with Sikh history but do not match the deed in question. Regarding the mentioned religion leader, Guru Tegh Bahadur was a leader of the Sikh religion. He was executed by Mughal Emperor Aurangzeb for refusing to convert to Islam and for defending the religious freedom of Hindus. Thus, the correct answer to the initial question is c. Maharaja Ranjit Singh, and for the secondary reference, the religion of Guru Tegh Bahadur is a. Sikh.