I know for sure one group would be merchants. They were the ones travelling to potentially infected areas---buying things with the plague's germs, and selling it to people on areas that WEREN'T previously infected. Sailors too I believe, for very similar reasons and because rats were infected, and rats caught rides on ships and spread the disease wherever the ship docked.
Hope this helped. :)
A.) Poison Gas is the answer
The field studies of Japanese primatologist Kinji Imanishi about bonobos <u>revealed the importance of social cooperation</u> rather than competition.
Kinji Imanishi wanted to expand his views among great apes’ attack behaviors and social ranking, that is why he opted to investigate and demonstrate the Bonobos social cooperation rather than competition.
