If \(\frac{x}{y} = \frac{{a + 2}}{{a - 2}}\), then \(\frac{{{x^2} - {y^2}}}{{{x^2} + {y^2}}} = \)?

• A. \(\frac{{2a}}{{{a^2} + 2}}\)
• B. \(\frac{{4a}}{{{a^2} + 4}}\)
• C. 1
• D. None of the above