D. There were many new foods to which immigrants had to acclimate
Mental breakdowns happen to ppl who have something mentally wrong with them and they would need help with that. It is common with serial killers and first time murderers.
It convinced cubists that new art styles were needed to depict the modern world.
A factor which didn't lead to decolonization movements in Africa would be Greed - b. Greed was actually the reason why there was colonialization in the first place in Africa. The people at the time saw this as an excelllent opportunity to make a lot of money.