Which option has the incorrect or inappropriate usage of 'train'?
- AThe sound of laughter and loud music from the neighbour's house disturbed his train of thought as he was writing his farewell speech.
- BIf you really want to see the landscape and the scenic countryside, it is better to take a train or go by road, rather than by plane.
- CBy following the train of blood on the platform the police located the body of a young woman who had been brutally stabbed.
- DMy friend has picked up a stray dog from the street and is now looking for somebody to train and domesticate the animal.