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The correct option is B. twice.
If a black hole suddenly doubled in mass, the event horizon would become twice its original size.
What is a blackhole?
In space, a black hole is a location where gravity pulls so strongly that even light cannot escape. Because stuff can fit into such a small space thanks to gravity, this is a strength of our universe. When a star dies, things like this may occur.
No light can escape, so people cannot perceive black holes. They are invisible. The search for black holes can be aided by space telescopes equipped with exceptional instruments. The special equipment can detect how stars that are very close to black holes behave differently from other stars.
What is event horizon?
The border around a black hole from which nothing (not even light) can escape is known as the "event horizon." In other words, an object inside the event horizon has an escape velocity that is faster than light. The name is derived from the fact that nothing occurring inside it can be seen; it is an invisible horizon. As a result, the event horizon successfully conceals the singularity at the center of the black hole, which is a relief for astrophysicists who are troubled by how the laws of physics break down at such a location.
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