Which Universe term is correctly associated with important feature: “its boundary is called the event horizon”, and also with “its gravity strongly bends spacetime”?

Correct Answer: Option C — Black hole. Black hole is correct because it is its boundary is called the event horizon. It is also associated with its gravity strongly bends spacetime. Together, these two facts identify Black hole precisely within Universe. Why the other options are incorrect: Option A — Light-year: Light-year is the distance light travels in one year. It is also associated with approximately 9.46 trillion kilometres, so these facts identify Light-year rather than Black hole. Option B — Milky Way: Milky Way is Sagittarius A* lies at its centre. It is also associated with it belongs to the Local Group, so these facts identify Milky Way rather than Black hole. Option D — Andromeda Galaxy: Andromeda Galaxy is it is visible from Earth without a telescope under dark skies. It is also associated with it belongs to the Local Group, so these facts identify Andromeda Galaxy rather than Black hole. Exam Takeaway: Link Black hole with “its boundary is called the event horizon” and “its gravity strongly bends spacetime” for quick revision.