Which of the following is a quadratic equation?

• A. x² + 2x + 1 = (4 - x)² + 3
• B. x³ - x² = (x - 1)³
• C. 2x - 1 = (x - 1)²
• D. x(x+1)+8 = (x+2)(x-2)

• x³ - x² = (x - 1)³

Please select one of the options to reveal the correct answer.