A mass is suspended from the roof of a lift (elevator) by means of a spring balance. The lift (elevator) is

moving upwards and the readings of the spring balance are noted as follows:

Speeding up: RU Constant speed: RC Slowing down: RD

Which of the following is a correct relationship between the readings?

(A) RU  RC (B) RU = RD (C) RC < RD (D) RC  RD