Given:
The quadratic function is:

To find:
The graph of the given quadratic function.
Solution:
The vertex form of a quadratic function is:
...(i)
Where, a is a constant and (h,k) is the vertex of the graph of the quadratic function.
We have,
...(ii)
On comparing (i) and (ii), we get



Now,

It means the vertex of the graph of the given function is at point (-2,1).
Only in graph C, the vertex of the parabola is at (-2,1).
Therefore, the correct option is C.