The only true option from the list would be that "<span>In time a fifth group was added to the caste system--the untouchables," since this was a later development and not an initial part of the system. </span>
All three of them were born in Chicago, Illinois.
Sahel is a very desert like area. It is hot but not as humid as a rain forest would be because of the lack of water.
The Interstate Highway System was one of the protections from Cold War that is still in use today. It made commercial, recreational, and military transport easier.
The correct answer among the choices provided is the second option.Fewer than a thousand federal employees were fired for security reasons.