Which of these texts is most likely to contain information about the caste system?

The text that is most likely to contain information about the caste system is called the Bhagavad-gita. There, lord Krishna names 4 types of caste - Brahmins, Kshatriyas, Vaishyas and Shudras, according to their quality of work. 

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.