Which of the following refers to "A hypothetical region of space from which nothing, not even light, can escape"?
Black Hole
Black Hole is correct.
A black hole is a region of space where gravity is so strong that nothing, not even light, can escape from it. It forms when a very massive star collapses under its own gravity.
The event horizon is only the boundary of a black hole, the surface beyond which escape becomes impossible; the region itself is the black hole.
A singularity is the point at the centre of a black hole where density becomes infinite, not the whole region. A wormhole is a hypothetical tunnel connecting two distant points in space-time, and it is not defined by light being unable to escape.
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