A Hole Is Drilled to the Center of the Earth

Multiple Choice

A hole is drilled to the center of the earth and a ball is dropped into it. When the ball is at the earth's center, compared with their respective values at the earth's surface,

A) its mass and weight are the same.
B) its mass and weight are both 0.
C) its mass is the same and its weight is 0.
D) its weight is the same and its mass is 0.