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When a proton is released from rest in a...

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 `nu_0` it moves with an initial acceleration `2a_0` toward west. The electric and magnetic fields in the room are

A

`(ma_0)/e west, (2ma_0)/(ev_0) up`

B

`(ma_0)/e west, (2ma_0)/(ev_0) down`

C

`(ma_0)/e east, (3ma_0)/(ev_0) up`

D

`(ma_0)/e east, (3ma_0)/(ev_0) up`

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