As I am thinking you mean "Producers" when you say "Sellers" I am going to go with, Yes. You are correct it is Supply.
(Also the other one is called Demand not price)
The powers of the national government are limited
C. Unit North and South Korean under a communist government
From what I know ethnocentrism means someone who thinks their culture is higher than another therefore I would go with A.
The definition of exclusive language is C. "Exclusive language is words that exclude various groups of people." The word "exclusive" means to exclude something or someone. A person can use exclusive language to exclude someone and make them feel rejected, not valued or not part of a group of people or society. Exclusive language is often used to discriminate against people because of their race, religion, gender, sexual orientation, disability or education levels. Words are powerful and we need to be careful how we use them.