The drift velocity of electrons in a conducting wire is of the order of `1mm//s`, yet the bulb glows very quickly after the switch is put on because 

Options

A. The random speed of electrons is very high, of the order of 10^6 m/s
B. The electrons transfer their energy very quickly through collisions
C. Electric field is set up in the wire very quickly, producing a current through each cross section, almost intantaneousty
D. All of above

Answer

C