Let $$\frac{{\text{a}}}{{\text{b}}}: - \frac{{\text{b}}}{{\text{a}}} = {\text{x}}:{\text{y}}{\text{.}}$$If $$\left( {{\text{x - y}}} \right) = $$$$\left\{ {\frac{{\text{a}}}{{\text{b}}}{\text{ + }}\frac{{\text{b}}}{{\text{a}}}} \right\}{\text{,}}$$then x is equal to -

• A. $\frac{{a - b}}{a}$$
• B. $\frac{{a + b}}{a}$$
• C. $\frac{{a + b}}{b}$$
• D. one of these