When a body is thrown up in a lift with a velocity `u` relative to the lift, the time of flight is found to be `t`. The acceleration with which the lift is moving up is
A. `((u-g t))/(t)` upwards
B. `((u-g t))/(t)` downwards
C. `((2u-g t))/(t)` upwards
D. `((2u-g t))/(t)` downwards
