Which Universe term is correctly associated with important feature: “the brightest star in Earth's night sky”, and also with “it is about 8.6 light-years from Earth”?

Correct Answer: Option C — Sirius. Sirius is correct because it is the brightest star in Earth's night sky. It is also associated with it is about 8.6 light-years from Earth. Together, these two facts identify Sirius precisely within Universe. Why the other options are incorrect: Option A — Proxima Centauri: Proxima Centauri is the nearest known star to the Sun. It is also associated with it is about 4.24 light-years away, so these facts identify Proxima Centauri rather than Sirius. Option B — Polaris: Polaris is commonly called the North Star. It is also associated with it lies close to the north celestial pole, so these facts identify Polaris rather than Sirius. Option D — Betelgeuse: Betelgeuse is it marks one shoulder of Orion. It is also associated with it is a variable star nearing a late evolutionary stage, so these facts identify Betelgeuse rather than Sirius. Exam Takeaway: Link Sirius with “the brightest star in Earth's night sky” and “it is about 8.6 light-years from Earth” for quick revision.