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Correct Answer: Option D — Crab Nebula. Crab Nebula is correct because it is it contains the Crab Pulsar. It is also associated with a supernova remnant. Together, these two facts identify Crab Nebula precisely within Universe. Why the other options are incorrect: Option A — Black hole: Black hole is its gravity strongly bends spacetime. It is also associated with a region where escape velocity exceeds the speed of light, so these facts identify Black hole rather than Crab Nebula. Option B — Light-year: Light-year is approximately 9.46 trillion kilometres. It is also associated with a unit of distance, so these facts identify Light-year rather than Crab Nebula. Option C — Milky Way: Milky Way is it belongs to the Local Group. It is also associated with a barred spiral galaxy, so these facts identify Milky Way rather than Crab Nebula. Exam Takeaway: Link Crab Nebula with “it contains the Crab Pulsar” and “a supernova remnant” for quick revision.
