Let f(x) = (5)/(6x+6). If h ≠ 0, what is the simplified form of the difference quotient (f(x+h) - f(x))/(h)?
A. (A)/((Bx+Ch+6)(Dx+6))
B. (A)/((Bx+Ch+6)(Dx+6))
C. (A)/((Bx+Ch+6)(Dx+6))
D. (A)/((Bx+Ch+6)(Dx+6))