Which shows one way to determine the factors of x3 + 4x2 + 5x + 20 by grouping?

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Which shows one way to determine the factors of x3 + 4x2 + 5x + 20 by grouping?

a. x(x2 + 4) + 5(x2 + 4)
b. x2(x + 4) + 5(x + 4)
c. x2(x + 5) + 4(x + 5)
d. x(x2 + 5) + 4x(x2 + 5)