From the wording of your question, especially the words "the following", I'm pretty sure you're looking at a list of choices that you're not sharing. There's no way that anyone can pick the right one if he can't see the list.
In most urban areas, it is very common that there is a lot of pollution as a result of all the cars and pollutant producing things like vehicles. Thus making it quite a problem as it can have many health implications (if on a large scaled (see cities like China where people have had to wear masks to prevent any toxication)). Pollution also contributes to global warming which is an ongoing issue that affects the entire world.
Biological warfare (mustard gas)
Robbery and murder where very common on the road to the west. Coming across food was rare. Many people froze or starved on the road.
But while it was terrible for most, a lot brought along pigs, chicken, wheat, and other eatable things to last them the trip. This was useful and could make for a better experience. You could tell why you and your family are traveling west, is it for a better life or do you have family over there? Where are you going? Are you rich or poor? How old are you? What is your family like, these factor in.
