I would go with 'Major sandstorms destroyed the crops' because the Indus Valley civilization most likely declined by something affecting the food.
Answer:
C persistent
Explanation:
I GOT IT RIGHT ON EDGE NO CAP
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A. Unrestricted Submarine Warfare.
This caused Germans to attack vessels that carried US citizens, bringing the US into the war.
It would be <span>Some nations agreed to disarmament but some did not. Nations which has large armies and weapons usually doesn't agree in disarmament because it will give a strain and more effort are required to disband to follow the disarmament treaty. Also those nations who have an advantage in military power would not agree to lessen its power for the lesser power.</span>
