[单选题]
A ball drops some distance and gains 3v k- c.wrmi.6i0 J ,vos)y fv* l:ijfe*:rof kinetic energy. Do not ignore air resistance. Howf*y:)iv *rjel:ovfs , much gravitational potential energy did the ball lose?
A. more than 30 J
B. exactly 30 J
C. less than 30 J
D. cannot be determined from the information given
