An electron falls from.rest through a vertical distance h in & uniform and vertically upward directed electric,field B. The direction of electric field is now reversed,keeping its magnitude the same. A protonisallowed to fall from rest in it through the'samejvertical distance h. The time of fall of the‘electron, in comparison to the time of fall of the proton is

A

equal

B

10 times greater

C

5 times greater

D

smaller