Which of the following pairs represent the same rational number?

• A. \[\frac{-7}{21}\] and \[\frac{1}{3}\]
• B. \[\frac{1}{3}\] and \[\frac{-1}{9}\]
• C. \[\frac{-5}{-9}\] and \[\frac{5}{-9}\]
• D. \[\frac{8}{-5}\] and \[\frac{-24}{15}\]