How did diplomacy affect Austria-Hungary during WW1

The assassination of the Austrian imperial heir Archduke Franz Ferdinand by a Serbian nationalist in Sarajevo in 1914 led to a declaration of war on Serbia.

Because Serbia was a Slavic Russian ally, the czarist government declared war on Austria-Hungary.  Germany declared war on Russia because it had an alliance with Austria.  Then France had to declare war on Germany and Austria-Hungary because of its committments to Moscow. And so on.

The policy of military alliances and secret diplomatic arrangements  practiced in the decades before WWI, conducted recklessly to a large extent by all great powers of Europe, constructed a web of mutual compromises that led to the great continental and global conflict we know as WWI, causing a sort of chain reaction. The war went on for 4 years and caused unimaginable loss of lives and destruction.

Explanation:

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b