When a proton is released from rest in a room, it starts with an initial acceleration a 0 towards west. When it is projected towards north with a speed v 0 it moves with an initial acceleration 3a 0 toward west. The electric and magnetic fields in the room are

1. A. ma 0 e west, 2ma 0 ev 0 up
2. B. ma 0 e west, 2ma 0 ev 0 down
3. C. ma 0 e east, 3ma 0 ev 0 up
4. D. ma 0 e east, 3ma 0 ev 0 down

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