Option 1 -> Biting wind directly describes harsh cold weather conditions mentioned in the passage.
Option 2 -> Snow falling is a clear indicator of cold winter weather.
Option 3 -> Wearing thick gloves shows protection against cold weather.
Option 4 -> A black portmanteau is simply luggage; its color or presence has no connection to weather conditions.
Hence, Option 4: the stranger carried a black portmanteau -> The portmanteau (a type of suitcase or traveling bag) is merely an item the stranger was carrying and has no relevance to indicating cold weather, unlike the other options which all directly relate to cold conditions -> correct