Which Universe term is correctly associated with classification or identity: “a binary star system”, and also with “located in the constellation Canis Major”?

Correct Answer: Option A — Sirius. Sirius is correct because it is a binary star system. It is also associated with located in the constellation Canis Major. Together, these two facts identify Sirius precisely within Universe. Why the other options are incorrect: Option B — Proxima Centauri: Proxima Centauri is a red dwarf star. It is also associated with part of the Alpha Centauri stellar system, so these facts identify Proxima Centauri rather than Sirius. Option C — Polaris: Polaris is a Cepheid variable star. It is also associated with located in Ursa Minor, so these facts identify Polaris rather than Sirius. Option D — Betelgeuse: Betelgeuse is a red supergiant star. It is also associated with located in the constellation Orion, so these facts identify Betelgeuse rather than Sirius. Exam Takeaway: Link Sirius with “a binary star system” and “located in the constellation Canis Major” for quick revision.