The correct way to write the sentence, "To prove he is right, Goha fakes his death." is by adding a comma after the dependent clause "to prove be is right" because it not only separates the dependent and independent clause but also adds a pause.
The other options are wrong because a comma has the function of separating items or ideas in a sentence to enhance understanding.
I'm not completely sure about all these, but I'd say that these phrases best support the author's purpose of creating a positive image of a town: 'live in harmony', 'blaze of color', and perhaps 'hillside…