Two masses of 4 kg and 5 kg are connected by a string passing through a frictionless pulley and are kept on a frictionless table as shown in the figure. The acceleration of 5 kg mass is
A. `49m//s^(2)`
B. `5.44m//s^(2)`
C. `19.5m//s^(2)`
D. `2.72m//s^(2)`