A stream of electrons and protons are directed towards a narrow slit in a screen (see figure). The intervening region has a uniform electric field (vertically downwards) and a uniform magnetic field \(\mathbf{B}\) (out of the plane of the figure) as shown. Then

1. A electrons and protons with speed \(\frac{|\mathrm{E}|}{|\mathbf{B}|}\) will pass through the slit
2. B protons with speed \(|\mathrm{E}| /|\mathrm{B}|\) will pass through the slit, electrons of the same speed will not
3. C neither electrons nor protons will go through the sit irrespective of their speed
4. D electrons will always be deflected upwards irrespective of their speed