Because he was assassinated by Serbian rebels. Most of Europe was allied with someone, a tangle of alliances. Serbia was allied Russia. Austria-Hungary didn't like Serbia. Well when the Archduke decided to visit Sarajevo, he was assassinated by a Serbian assassin. Because of that, Austria-Hungary wanted to punish Serbia and declared war. Well Austria-Hungary was allied with Germany and Italy. And Serbia was allied with Russia. Well Russia attacked Austria-Hungary and Russia was allied with both Great Britain and France.... So it triggered a chain reaction like that.
Freud proposed that psychological development in childhood takes
place in the following stages (by order): oral, anaI, phallic,
latency, and genital.
The oral stage goes
from birth to eighteen months of age. The
main focus is pleasure seeking through the infant’s
mouth, they need to taste and suck. if not, the infant will be fixated
leading to adult habits such as smoking, thumb-sucking, over-eating, and
baiting nails.
The answer is oral stage.
C is the correct answer I believe!