Answer:
B. "We were taken from the platform an hour later, frozen and insensible, at the next station..."
Step-by-step explanation:
Setting refers to the time and place in which a story is told.
In the citation: "We were taken from the platform an hour later, frozen and insensible, at the next station...", we can see the time, 'an hour later', and the place, 'from the platform', being mentioned.
The other two options, A and C, make no mention of any time or place, and therefore aren't examples of setting.