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Which statement best states the main point of the passage?

A (C)Vertical farming can efficiently provide fresh fruits and vegetables to urban residents while reducing damage to the environment.

Answer (C) provides a good summary of the entire passage. You can immediately eliminate (A) and (D) because they don’t mention vertical farming, the subject of this passage. The passage is not about traditional farming (D) or finding an alternative to organic farming (A). Answer (B) makes a point not brought up until near the end of the last paragraph, so this choice also can be eliminated.