A) a (curvature) singularity
B) a horizon
C) either a (curvature) singularity or a horizon
D) a charge
Correct Answer: C
Solution :
Black holes are regions of space lime from which nothing, not even light, can escape. A typical black hole is the result of the gravitational force becoming so strong that one would have to travel faster than light to escape its pull. Such black holes contain a space time singularity at their centre.
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