i know the last one is true but im not sure about the other ones
but the last one is a definite
<span>smaller-sized communities age and gender divisions little knowledge of plants and animals moving around a lot no understanding of tools and fire</span>
Technically, yes. Unless they are already an American citizen on vacation.
The correct answer is - B. They had pledged to fight with other countries.
After the assassination of archduke Ferdinand in 1914 lots of countries quickly joined World War I because they had already pledged to fight with other countries. The terrain for war was pretty much set, and alliances were already made, the interests were known and on the table for few years before that, so the assassination of archduke Ferdinand was just the point that marked the starting point of the almost inevitable war.