Step 1: Understanding Purana Qila.
Purana Qila, also known as Old Fort, is located in Delhi. It is one of the oldest forts in India and dates back to the 16th century, built by the Mughal emperor Humayun. It is an important historical site in Delhi.
Step 2: Analyzing the options.
(A) Patna: This is incorrect. The Purana Qila is not in Patna.
(B) Allahabad: This is incorrect. Purana Qila is not in Allahabad.
(C) Delhi: Correct. Purana Qila is located in Delhi.
(D) Lucknow: This is incorrect. The Purana Qila is not in Lucknow.
Step 3: Conclusion.
The correct answer is (C) Delhi, as the Purana Qila is located in Delhi.