单项选择题

For the system shown in the figure, if the OP = 16% and wn = 10 rad/s, when a unit step input is subjected to this system, pls. evaluate a = (   ) and b = (   ).

A、a=1
b=10
B、a=10
b=1
C、a=10
b=10
D、a=1
b=1