Its because of people burning fossil fuels and causing pollution.
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They needed people to work the factories with the men are gone to war.
Answer:
Its A. ( I also took the test )
Explanation:
It is the only one that would be appropiate if you think about it.
GDP mean gross domestic products so in simpler terms it means what you sell as a product, so if your GDP is high and you are economically stable your most likely a developed country that has a good economy ( so answer A )