Answer:
<u>A</u> is the answer.
Living conditions were harsh and the people had little food.
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The friends who got food poisoning all ate at the same
restaurant for dinner, while the friends who did not get food
poisoning did not.
Food poisoning is basically contaminated food. The main cause of food poisoning is bacteria. It is estimated that there are over 250 bacteria that can cause food poisoning. Correlation is the act of something have a causative relation with an effect.
