Http://www.amazon.com/Empire-Cotton-A-Global-History/dp/0375414142
first person to drill for oil. Edwin L. Drake invented the telephone. Alexander Graham exclusive right to manufacture or sell an invention. patent.
I believe that the most likely answer is (D).
But, I can't shake that (E) is a possible answer.
Narrowed it down at the very least.
Answer:The Aryans in the Indus River Valley had a Caste System, which meant that whatever social class you were born into, that's the one you're in for your whole life.
"The people were born into social classes and remained there all their lives."
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Explanation: