o-level physics mcq help needed

[MONJUR HASAN NISHAD]

i have seen many mcqs similar to this one...but don't know the basic to solve it..plz tell me someone

 

[Tharindu]

Use the Flemings left hand rule.....the thumb take as force, the fore finger as magnetic field....the current is in the opposite direction of electrons.....that how it works take the current ( middle finger) to the opposite of electron direction