49.
Your Answer is
Correct Answer is C
Explanation
Here we want to express the scenery outside the train.
Item C: Refers to the outside scene from the train, correct.
A item: the train's vision refers to the scene of the train.
B item: train's vision from the window refers to the scene of watching the train from the window.
Item D: Refers to the scene of the train. The expression is wrong, vision does not belong to train, and item A/B is excluded.