An electron and a proton enter region of uniform magnetic field in a direction at right angles to the field with the same kinetic energy. They describe circular paths of radius `r_(e)` and `r_(p)` respectively. Then
A. `r_(e)=r_(p)`
B. `r_(e)ltr_(p)`
C. `r_(e)gtr_(p)`
D. `r_(e)` may be less than or greater than `r_(p)` depending on the direction of the magnetic field
