PLEASE HELP!!

The equation for the axis of symmetry for the graph of a quadratic function is x = –2. Which of the following could not be the equation of the function?

A.
y=-2x^2-8x+3
B.
y=1/2x^2+2x-1
C.
y=4x^2-16x+2
D.
y=3x^2+12x