Question

A x=0
B X=2
C X=6
D X=-2
.........

Answer 1

The answer sould be B X=2

Answer 2

The axis of symmetry is the x value of the vertex and the vertex in this case is at (2, 2) so your axis of symmetry is x = 2 which is B!
(the vertex is the minimum or maximum point of the parabola, in this parabola it is the minimum)