The correct answer is (c) Lahore.
Lahore was the capital of the Sikh Empire from 1799 to 1849. It was founded by Maharaja Ranjit Singh, who unified the Sikh principalities into a single kingdom. Lahore was a major center of trade and culture during the Sikh Empire. It was also home to many important Sikh temples, including the Golden Temple.
Kapurthala was a princely state in Punjab, India. It was founded in 1753 by Maharaja Amar Singh. Kapurthala was a vassal state of the Sikh Empire from 1799 to 1849.
Amritsar is a city in Punjab, India. It is the holiest city in Sikhism. Amritsar was founded in 1577 by Guru Ram Das. The Golden Temple, the holiest Gurdwara in Sikhism, is located in Amritsar.
Patiala was a princely state in Punjab, India. It was founded in 1763 by Maharaja Ala Singh. Patiala was a vassal state of the Sikh Empire from 1799 to 1849.