The value of $$\frac{5.71 × 5.71 × 5.71 - 2.79 × 2.79 × 2.79}{5.71 × 5.71 + 5.71 × 2.79 + 2.79 × 2.79}$$is :

• A. 0.82
• B. 0.92
• C. 0.5
• D. 0.6