A single-step numerical approximation with step size h=0.4 gives an absolute error of 0.048 at the target point. Assuming the global error is approximately proportional to h, which of the following is the smallest integer denominator n such that using a step size h=n0.4 is predicted to reduce the error below 0.01?
a) n=4
b) n=5
c) n=2
d) n=3