The assassination of Archduke Ferdinand might have been the trigger of WWI but the gunpowder to ignite the conflict was . a.
the economic conditions.
c.
U. S. neutrality
b.
Marxism.
d.
the military alliances.

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d. the military alliances.

Explanation:

The failure of Serbia and Austrio-Hungary to be able to solve their problems without war was what led to the eventual declaration of war on Serbia by Austrio-Hungary. Normally, it would have been an ordinary war, but Serbia was allied to Russia, who was in turn allied too France and Britain, causing a domino effect in which each country successively declared war in an effort to show their support to their allies. This in turn turned what would have been a territorial war into a global war.

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b. young children below the minimum age were working