c
The expression to calculate the drift speed is given by,

\(i = neAv _{ d }\)

Calculate the value of \(n\) as follows.

\(n =\frac{ N _{ A }}{ V } \times \frac{ M }{ m _{ W }}\)

\(=\frac{ N _{ A } \rho}{ m _{ w }}\)

\(=\frac{6 \times 10^{23} \times 2.7 \times 10^{3}}{27 \times 10^{-3}}\)

\(=6 \times 10^{28}\)

Substitute the values in the above expression.

\(i = neAV _{ d }\)

\(v _{ d }=\frac{ i }{ neA }\)

\(=\frac{10 \times 10^{19}}{6 \times 10^{28} \times 4 \times 10^{-6} \times 1.6}\)

\(=2.6 \times 10^{-4} m / s\)