I am pretty sure its D. I am not 100% positive but I read an article and that appears to be correct.
1. malaria 2. rivers had terrible waterfalls..too dangerous...until the steam engine was invented it was incredibly dangerous 3. deserts....they didn't know how to travel through the deserts and find an oasis which made it very difficult to travel through
That would be in an o<span>ligarchy. </span>
4. because if other countries deny what happened they do not learn from it and it can happen again 5 look for facts do your own resheach and don't take any information for granted (too late lol)
