If f (x) = 2x^2 and g (x) = x^2 + 2x, which expression represents f (g (x)) ?

A) 2x^4 + 4x^2

B) 4x^4 + 4x^2

C) 2x^4 + 8x^2

D) x^4 + 4x^3 + 4x^2

E) 2x^4 + 8x^3 + 8x^2

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