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Correct Answer: Option D — Proxima Centauri. Proxima Centauri is correct because it is it is about 4.24 light-years away. It is also associated with a red dwarf star. Together, these two facts identify Proxima Centauri precisely within Universe. Why the other options are incorrect: Option A — Polaris: Polaris is it lies close to the north celestial pole. It is also associated with a Cepheid variable star, so these facts identify Polaris rather than Proxima Centauri. Option B — Betelgeuse: Betelgeuse is it is a variable star nearing a late evolutionary stage. It is also associated with a red supergiant star, so these facts identify Betelgeuse rather than Proxima Centauri. Option C — Crab Nebula: Crab Nebula is it contains the Crab Pulsar. It is also associated with a supernova remnant, so these facts identify Crab Nebula rather than Proxima Centauri. Exam Takeaway: Link Proxima Centauri with “it is about 4.24 light-years away” and “a red dwarf star” for quick revision.
