If f(x) = x/3 - 2 and g(x) = 3x^2 + 2x - 6, find (f + g)(x).

A. 3x^2 + 7/3x - 8

B. 3x^2 +2/3x - 8

C. x^2 + 12

D. 3x^2 + 5/3x + 4