Question

why cant light escape from a black hole?
because it is very cold
because of its immense gravity
because it is very far away
because it is made of gas

Explanation:

A black hole has extremely strong gravity due to its high mass concentrated in a very small space. According to the theory of general relativity, this intense gravitational field warps spacetime so much that even light, which has no mass, cannot escape. Temperature (coldness), distance, or composition (being made of gas) are not the reasons for light not escaping.

Answer:

Because of it's immense gravity