One Day, While Straying Dangerously Close to a Black Hole

Multiple Choice

One day, while straying dangerously close to a black hole, an astronaut notices that no matter how hard he tries to remain at rest, he is inevitably drawn into the black hole unless he keeps moving. What does this tell an observer about the black hole?

A) The black hole is evaporating.
B) The black hole is supermassive.
C) The black hole is electrically charged.
D) The black hole is rotating.