Final answer:
The true story of Gatsby's life is revealed when a reporter interviews him and the rumors about his past are compared to the true events by the narrator.
Step-by-step explanation:
The true story of Gatsby's life is revealed in option C. In the novel, a reporter comes to Gatsby's home and interviews him. Afterward, the rumors about Gatsby's past are compared by the narrator, Nick Carraway, to the true events of Gatsby's life. This allows the readers to learn about Gatsby's background and understand his rise and fall.