A 60 kg body is pushed with just enough force to start it moving across a floor and the same force continues to act afterwards. The coefficient of static friction and sliding friction are 0.5 and 0.4 respectively. The acceleration of the body is
A. `6 m/s^(2)`
B. `1 m//s^(2)`
C. `2.5 m//s^(2)`
D. `3 .8 m//s^(2)`