If `alpha` and `beta` are the roots of quadratic equation`x^2+ px + q=0` and `gamma` and `delta` are the roots of `x^2 + p x-r=0

If `alpha` and `beta` are the roots of quadratic equation`x^2+ px + q=0` and `gamma` and `delta` are the roots of `x^2 + p x-r=0` then `(alpha-gamma)(alpha-delta)`
A. p + q
B. q - r
C. r - q
D. q + r

If `alpha` and `beta` are the roots of quadratic equation`x^2+ px + q=0` and `gamma` and `delta` are the roots of `x^2 + p x-r=0` then `(alpha-gamma)(

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