Find r(x + 1) if r(x) = x^3 + x + 1
A. x^3 + 3x^2 + 4x + 3
B. x^3 + 4x^2 + 5x + 3
C. x^3 + 2x + 3
D. x^4 + x^3 + x^2 + 2x + 1
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