(consider this) in 1975, mcdonald's introduced its egg mcmuffin breakfast sandwich, which remains popular and profitable today. this longevity illustrates the idea of
a. opportunity cost.
b. upsloping supply.
c. consumer sovereignty.
d. specialization

C. consumer sovereignty.

Explanation:

Consumer sovereignty in economics imply that consumers have the power to determine what will be produced. They do this by demanding for products they want, increasing its supply and demanding less of products they do not want which reduces its supply.

I hope my answer helps you

i think you have to let the moderators that you want your old account to be activated.

answer; is the sum of all individual demands curves;