$$\frac{{{{\left( {a - b} \right)}^2} - {{\left( {a + b} \right)}^2}}}{{ - 4a}}{\text{ = }}\frac{x}{y}$$On simplifying the given equations, which of the following equations will be obtained ?

• A. y = b
• B. x = y
• C. b = x
• D. b = x
• E. y = x