How did alliances contribute to the start of World War I? a) Alliances made it easier for nations to negotiate peace treaties.
b) Because of alliances, fewer nations needed to participate in the war.
c)Alliances required nations to defend each other against aggression.
d)A set of alliances helped nations respond peacefully to problems.

c) Alliances required nations to defend each other against aggression.

Explanation:

Secret alliances were formed prior to the outbreak of the war. After the Assassination of Franz Ferdinand the Archduke of Austria-Hungary the alliance systems went into effect leading to many nations protecting one another.

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