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. "

i’m   sure probably just geuss and see which one you can get right, i’m pretty sure it is the combination of goods and services

probably 3 since archeologists and historians don’t understand there writing.