Answer
c
Work Step by Step
The elevator is moving upwards at a slowing rate, meaning it is accelerating downwards. Because force is directly proportional to acceleration, the corresponding force vectors should have a net force pointing downwards. Answer C has a upwards force of tension $\overrightarrow{T}$ that is smaller than the force of gravity $\overrightarrow{G}$ pointing downwards, so the net force is downwards, resulting in an acceleration downwards as well.
