If the Sun Were Replaced by a 1-Solar-Mass Black Hole

If the Sun were replaced by a 1-solar-mass black hole, then Earth would

A) enter an elliptical orbit passing close to the black hole, with its farthest distance from the black hole equal to 1 au.
B) spiral quickly into the black hole.
C) head off into interstellar space along a straight-line tangent to its original orbit around the Sun.
D) continue to orbit the black hole in its present orbit.