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Correct Answer: Option B — Sun. Sun is correct because it is the star at the centre of the Solar System. It is also associated with the photosphere is its visible surface. Together, these two facts identify Sun precisely within Universe. Why the other options are incorrect: Option A — Sirius: Sirius is located in the constellation Canis Major. It is also associated with the brightest star in Earth's night sky, so these facts identify Sirius rather than Sun. Option C — Proxima Centauri: Proxima Centauri is part of the Alpha Centauri stellar system. It is also associated with the nearest known star to the Sun, so these facts identify Proxima Centauri rather than Sun. Option D — Polaris: Polaris is located in Ursa Minor. It is also associated with commonly called the North Star, so these facts identify Polaris rather than Sun. Exam Takeaway: Link Sun with “the star at the centre of the Solar System” and “the photosphere is its visible surface” for quick revision.
