The 1920's was a time of sensational economic growth and progress. Mass produced goods such as clothing, radios and cars were in abundance. The stock market boomed and most Americans benefited. But there was also economic inequality, thus the prosperity of the 1920's was unsustainable.
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Answer: D) contentedly </h3>
"contentedly" is basically another way of saying "happily"
This word modifies the verb "lives". It describes in more detail how the animal lives, rather than just simply saying "the elephant lives"
elephant = noun
endangered = adjective, since it describes the noun (elephant)
