Read the sentence from Passage 1.
The Aztecs used a special system that turned straw into gold by creating new land for farming. (Paragraph 1)
What does the metaphor “turned straw into gold” suggest about the Aztec’s system of farming?
that it was a risky move that paid off
that it created a system for trading goods
that it made those who invented rich with gold
that it was an impressive way of using resources