What Is the Radius of the Event Horizon for the 4

Multiple Choice

What is the radius of the event horizon for the 4 *10⁶ M _$\odot$ black hole at the center of the Milky Way?

A) 0.02 AU
B) 0.08 AU
C) 0.17 AU
D) 0.35 AU
E) 0.60 AU