Quadric functions q and w are graphed on the same coordinate grid. the vertex of graph of q is 18 units below the vertex of the graph of w.

which pair of functions could have been used to create the graph of q and w?
A q(x)18x^2 and w(x)=x^2
B q(x)=x^2+18 and w(x)=x^2
C q(x)=-18^2 and w(x)=x^2
D q(x)=x^2-18 and w(x)=x^2
I NEED HELP PLZ!