Question

why are black holes invisible?
a because they move too fast.

b because they are very small.

c because no light can escape from them.

d because they are very far away.

Explanation:

Black holes have an extremely strong gravitational pull within their event horizon, which is so intense that even light, the fastest known entity in the universe, cannot escape their gravitational grasp. Since we perceive objects when light reflects off them or is emitted by them, the absence of escaping light makes black holes invisible to direct observation.

Answer:

C. Because no light can escape from them.