The Event Horizon of a Black Hole Is Defined as

Multiple Choice

The event horizon of a black hole is defined as

A) the point of maximum gravity.
B) the radius of the original neutron star before it became a black hole.
C) the point at which shock waves emanate from the strong gravitational distortion the black hole creates in the fabric of spacetime.
D) the radius at which the escape speed equals the speed of light.