Suppose Each of the Following Objects Could Collapse into a Black

Multiple Choice

Suppose each of the following objects could collapse into a black hole. Each black hole would have a sphere around it that is the limit for escape -- once you are inside this region, you cannot get away. For which object would this region be the largest in diameter?

A) a star with the mass of our Sun
B) a planet like Jupiter
C) a star that was type O when it was on the main sequence
D) an entire cluster of stars (with about 150 stars in it)
E) an entire galaxy of stars (with about a billion stars in it)