Which term refers to the region of space from which nothing can escape due to gravity?

• A. The Moon
• B. Asteroid belt
• C. The region of space from which nothing can escape due to gravity
• D. Star cluster

Answer: (C)

This question tests how extreme gravity creates a boundary from which nothing can escape. When gravity is incredibly strong, the escape speed needed to break free exceeds even the speed of light, so nothing can get away. The region where this happens is a black hole, with the boundary called the event horizon. The phrase given describes that idea directly, naming the region where nothing can escape due to gravity. The Moon is just a satellite, the asteroid belt is a collection of rocks, and a star cluster is a group of stars bound together—none of these trap everything inside them. So the statement that describes a region from which nothing can escape best matches the concept of a black hole.