The ice age melted a straight which turned it into a sea which helped them migrate.
I think that it’s b because it’s kinda like what goes along with the question and what makes sense the most!!!!!
Answer:
Hope you are referring to WW1
the league of Nations who was formed. the league formation followed the agreement of treaty of Versailles . in addition, Germany was allowed to keep it's land but was to pay heavy penalties as a result