A primary group is a <span>small group of people who interact over a relatively long period of time on a direct and personal basis. This is opposed to a secondary group, where the members have an impersonal and indirect relationship.</span>
I believe your answer is C. Hope this helps!
What they found is in the first 2 paragraphs
AGUE, BILIOUS FEVER, DIPHTHERIA
World war 2 lasted from 1939-1945 world 2 was a global war including various of countries including United States United Kingdom Soviet Union axis power the nazi France Vietnam Canada Australia Mexico Brazil etc etc etc etc let me know if you need more info :)
