An electron having a charge e moves with a velocity $v$ in positive $x$ direction. A magnetic field acts on it in positive $y$ direction. The force on the electron acts in (where outward direction is taken as positive $z$-axis).
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(d)
$\vec{F}=-e(\vec{v} \times \bar{B})$
So using right hand thumb rule $\vec{F}$ will be in $-z$ direction.
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