What Impact Did World War I Have on European Colonialism

What impact did World War I have on European colonialism?

A) The huge cost of the war and of maintaining empires convinced the majority of Europeans that they should give up their colonies and focus on domestic issues.
B) It convinced Europeans of the necessity of their colonies but also pushed colonized peoples who had fought in the war to demand more rights and even independence.
C) Colonized peoples came to understand how reliant they were on European military and economic support, so they pushed for closer ties with their metropolitan colonizers.
D) Just as the postwar settlement spread democracy across eastern Europe, European colonizers encouraged political reform and nationalism throughout their colonies.