[单选题]
An object of mass m is hanging by a string from the 7 8 tut+tszl6sr7c(dk ceiling of an elugxe0g3/ cpt3 ws, dj.evator. The elevator is moving upward, but slowing down. What is ew ,0xd/usgt.gp3j 3cthe tension in the string?
A. less than mg
B. exactly mg
C. greater than mg
D. zero
