14. If the value of the fraction $\frac{3 x^{2}-12}{x^{2}+4 x+4}$ is 0, then the value of $x$ is ( ).
(A) 2
(B) $\pm 2$
(C) -2
(D) $\pm 4$
14.A. From $\left\{\begin{array}{l}3 x^{2}-12=0, \\ x^{2}+4 x+4 \neq 0,\end{array}\right.$ we get $x=2$.