[单选题]
A ball drops some di3b.xn/tzt(v605g+ rr cl0df;frk v p y1dl+ ua(*krz nstance and gains 30 J of kinetic energy. Do not ignore air uza1 kl(rd*n +resistance. How 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
