Doubt from Electro magnetic induction

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I am getting a,b,c don't know about d

Is answer ABCD
Options ABC correspond to same case.
Angle between 2 adjacent points of collision is 120 degree about centre.
In option D angle between 2 adjeacent points of collision is 60degrees about centre.

Yes ans is ABCD. But I could not imagine the motion of particle inside cylinder, can you pls draw the diagram

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