Which of the flowing countries was not an ally

What was the math that lit the explosion of World War I?

a. Assassination of Austrio-Hungary's Archduke Ferdinand by Serbian nationalist.

Which of the following countries was not an Ally?

d. Germany was not an ally, but was a key player in the Central Power.

What were the lethal underwater weapons used by the Germans?

a. U-Boats, which is pretty much submarines that were used by the Germans to try to break the British supply chain.

What was the name of the British ship carrying ammunition that was sunk?

a. Lusitania, which was a passenger British liner that was sunk by German U-Boats on transit. It was correctly thought to have been transporting war goods (which would have made it targetable), but it was definitely one of the sparks that led the US to join in the war completely on the Allied side.

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