Water in a bucket is whirled in a vertical circle with a string attatched to it. The water does not fll down even when thebucket is inverted at the top of its path. We conclude that in this position
A. `mg=(mv^2)/r`
B. mg is greater than `(mv^2)/r`
C. mg is not greater than `(mv^2)/r`
D. `mg is not less than (mv^2)/r