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Correct Answer: Option A — Milky Way. Milky Way is correct because it is a barred spiral galaxy. It is also associated with the galaxy containing the Solar System. Together, these two facts identify Milky Way precisely within Universe. Why the other options are incorrect: Option B — Andromeda Galaxy: Andromeda Galaxy is a spiral galaxy also catalogued as M31. It is also associated with the nearest large galaxy to the Milky Way, so these facts identify Andromeda Galaxy rather than Milky Way. Option C — Sun: Sun is a G-type main-sequence star. It is also associated with the star at the centre of the Solar System, so these facts identify Sun rather than Milky Way. Option D — Sirius: Sirius is a binary star system. It is also associated with located in the constellation Canis Major, so these facts identify Sirius rather than Milky Way. Exam Takeaway: Link Milky Way with “a barred spiral galaxy” and “the galaxy containing the Solar System” for quick revision.
