A wire of diameter 0.02 m contains 1028 free electrons per cubic meter. For an electric current of 100 amperes, the drift velocity for free electrons in the wire is most nearly:
a) 0.6 × 10^(-9) m/s
b) 1 × 10^(-19) m/s
c) 5 × 10^(-10) m/s
d) 2 × 10^(-4) m/s
e) 8 × 10^3 m/s