Archduke franz ferdinand was assassinated in june of 1914. after much hand-wringing and indecision on the proper response, austria-hungary declared war on serbia in august of 1914. europe was entangled in a series of complicated alliances that involved both serbia and austria. serbia was allied with russia, which was allied with france. while britain was in agreement with, but not yet in a formal alliance with france, austria and its ally germany formed the central powers, and by the end of august 1914 all these nations were at war.
this is happened in :
a. world war i
b. world war ii
c. world war iii