D. All of the above
Social stratification= the caste system stratifies classes in India
Social restriction= Rising within the class system is not an option
Social Discrimination= privileges and power are only available to high classes
The French and the Native Americans
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. :)
I believe the term you are looking for is called popular sovereignty.
(c) rosa parks
http://teacher.scholastic.com/rosa/sittingdown.htm
in case you want to know more about it