The number of free electrons per 100 mm of ordinary copper wire is $2 \times 10^{21}$. The average drift speed of electrons is 0.25 mm/s. The amount of current flowing would be: $\left(e=1.6 \times 10^{-19} C\right)$

0.2 A 2.5 A 5.0 A 0.8 A

0.8 A

The correct answer is Option (4) → 0.8 A