Use Vieta's formula for x² + px + q = 0. For this form, the sum of the roots is -p and the product of the roots is q. The given roots are -2 and 2, so their sum is -2 + 2 = 0. Since sum = -p, we have -p = 0, which gives p = 0. The product -2×2 = -4 also matches the constant term, so the roots are consistent. Therefore the correct answer is 0.