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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might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

a yes vote means: the legislature, with a two-thirds vote, could change daylight saving time if the change is allowed by the federal government. absent any legislative change, california would maintain its current daylight saving time period