The correct answer is A. Ghatshila.
Hindustan Copper Limited (HCL) is an Indian state-owned mining and metallurgical company headquartered in Kolkata, West Bengal. It is the largest integrated copper producer in India, with an annual production capacity of 1.2 million tonnes of refined copper. The company has its mines in Ghatshila, Jharkhand, and its smelter and refinery in Ghatsila, Jharkhand.
Option B, Ramgarh, is incorrect because HCL does not have any operations in Ramgarh.
Option C, Bokaro, is incorrect because HCL does not have any operations in Bokaro.
Option D, None of the above, is incorrect because HCL is situated at Ghatshila.