Mean Drift Velocity of Electron in a Copper Wire Having

Mean drift velocity of electron in a copper wire having cross-sectional area 5.0 × 10 ^-6 m² carrying current of 1 A and having number density 8.5 × 10 ²⁸ m³ is {{}}

A) 0.015 mm s^-1
B) 0.1 mm s^-1
C) 0.5 mm s^-1
D) 0.25 mm s^-1