5. Which quantity is greater?

$$\begin{array}{lcl} x> 0\\ \\ Column\: A:\:(x+3)(x-3)\\ Column\: B:\: (x+3)^{2}\\ \\ (A):If\: the\: quantity\: in \: Column\: A\: is \: greater;\\ (B):If\: the \: quantity\: in \: Column \: B\: is \: greater;\\ (C):If\: the \: two\: quantities\: are\: equal;\\ (D):If\: the\: relationship\: cannot\: be\: determined\\\, \, \, \, \, \, \, \, \, \, \, \: from\: the\: information\: given.\\ \end{array}$$