[单选题]
An object of mass m is hanging by 0pf:9j4o/jss5hff og a string fromy /ttay*rpc* 1 the ceiling of an elevator. The elevator is moving upward, but slowing down. What is t*yypac/rt* 1 the tension in the string?
A. less than mg
B. exactly mg
C. greater than mg
D. zero
