[单选题]
An object of mass m is hanging by a st volb8 pzwhd3 y7+1r5 zjjxu81ring from the ceiling of an elz;ci;oylt30 n036fs,rghyh b evator. The elevator is moving upward, o;z0b,y ;ns tch0ygil 6 r3fh3but slowing down. What is the tension in the string?
A. less than mg
B. exactly mg
C. greater than mg
D. zero
