Doubt from electrostatics

Is ans A, D?

Can u pls send soln for D?
I don’t know answer but I want clear soln for D.
Should we find time to reach below plate and find distance between 2 opp electrons .?is that the radius.?

Yes find that time . And see, there will be electrons which were emitted parallel to the upper plate and find the distance of the point where these electron will collide with bottom plate . That will be radius.

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