Andy and Charlie are riding on a merry go-round. Andy rides on a horse at the outer rim of the circular platform, four times as far from the center of the circular platform as Charlie, who rides on an inner horse. When the merry-go-round is rotating at a constant angular speed, which of the following best describes Andy's angular speed? PLEASE provide an explanation of your choice.

1) impossible to determine,
2) one-fourth of Charlie's,
3)four times Charlie's and
4) the same as Charlie's.