21. The main idea of the passage is that:
Your Answer is
Correct Answer is B
Explanation
Keynote
This article mainly introduces the great success of Waterfire and its huge impact on the city.
Item B: Waterfire brought Providence back to life.
Item A: The focus is not on Evans, but on Waterfire.
Item C: Public officals are not mentioned.
Item D: The symbolic meaning of waterfire is just a detail, not the main message.