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Correct Answer: Option A — Polaris. Polaris is correct because it is a Cepheid variable star. It is also associated with located in Ursa Minor. Together, these two facts identify Polaris precisely within Universe. Why the other options are incorrect: Option B — Betelgeuse: Betelgeuse is a red supergiant star. It is also associated with located in the constellation Orion, so these facts identify Betelgeuse rather than Polaris. Option C — Crab Nebula: Crab Nebula is a supernova remnant. It is also associated with located in the constellation Taurus, so these facts identify Crab Nebula rather than Polaris. Option D — Black hole: Black hole is a region where escape velocity exceeds the speed of light. It is also associated with often formed from the collapse of a massive star, so these facts identify Black hole rather than Polaris. Exam Takeaway: Link Polaris with “a Cepheid variable star” and “located in Ursa Minor” for quick revision.
