How did the assassination of Franz Ferdinand lead to Germany fighting against Russia?

The murder of Archduke Franz Ferdinand outraged AustriaHungary. Austria-Hungary was furious and with Germany's support, declared war on Serbia on July 28. Within days, Germany declared war on Russia—Serbia's ally and invaded France via Belgium, which then caused Britain to declare war on Germany.

well considering i can't see the graph, it's probably prices

hello

question:

when would a new household be started?

a.when the oldest male died

b.when a man and a woman married

c.when the house could not hold everyone

d.when a child was born

answer: us d when a child was born

hope this have a great day and brainlest