Which statement best expresses the reason world war i started?
a the growing tensions between serbia and russia were irreparable and war was inevitable.
b the heir to the austrian throne was assassinated.
c the wife of germany's leader was assassinated and negotiations of settlement between germany and serbia could not be reached.
d italy wanted to free italians under austro-hungarian rule.

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.