When the caste system was first developed, people were separated into groups that were designated by a. colors b. symbols c. numbers d. sounds

 The correct answer is : A. colors

Explanation:  Stratification based on race was called caste. There was the colonial aristocracy that was "white race", then far below them, far from the political and economic power are the "Indians" or also called "natural" and then below them are the slaves from Africa that was the "race" black. "

the boundarys like convergent divergent and transform it causes subduction

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.