Step 1: Understanding the Concept:
This question asks about the central setting or subject of Keki N. Daruwalla's poem "Fire-Hymn".
Step 2: Detailed Explanation:
The poem is set at a "burning ghat," which is a series of steps leading down to a river, used for the cremation of bodies in Hindu culture. The speaker, who is a Zoroastrian (Parsi), describes the scene of cremation and reflects on the nature of fire and the rituals surrounding death. The poem's imagery and themes all revolve around the events witnessed at this specific location.
Step 3: Final Answer:
The poem "Fire-Hymn" is centered around the speaker's experience at a burning ghat. Therefore, option (D) is the correct answer.