Answer:
I have another answer for you!
Step-by-step explanation:
1. Possibility to contract diseases
2. Possibility to get caught in a storm
3. Hard to get around barriers
1 is because there could be people with diseases at the place you are trading to, and if you catch that disease you could spread it to your civilization
2 is because if you get caught in a storm it could be hard to trade
3 is for the same reason basically lol.
You're welcome! Tell me if some of my answers are wrong.