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Free \( { }^{238} \mathrm{U} \) nuclei kept in a train emit alpha particles. When the train is stationary and a uranium nucleus decays, a passenger measures that the separation between the alpha particle and the recoiling nucleus becomes \( \mathrm{x} \) in time \( \mathrm{t} \) after the decay. If a decay takes place when the train is moving at a uniform speed \( v \), the distance between the alpha particle and the recoiling nucleus at a time \( t \) after the decay, as measured by the passenger will be -
(A) \( x+v t \)
(B) \( x-v t \)
(C) \( x \)
(D) depends on the direction of the train
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